When SGPro doesn't start, it can be frustrating, but using the list below we can systematically attempt to identify the issue.


Note: If one of these items does fix your issue, please share it with us so that we can prevent it from happening to you again.




No ASCOM Installation


In this case, SGPro should fail gracefully with a message indicating that ASCOM is not installed.  We do, however, have reports that in some circumstances, this does not happen and presents as a "hang".


Problem: ASCOM is not installed

Solution: Install the latest version of ASCOM found here.





Failure to Load the Last Sequence


SGPro, by default, will try to automatically open the last sequence you were using. If you are using this option (or more specifically, if you have never explicitly disabled this option), this issue might apply to you. This issue is most common when upgrading the version of SGPro and the new SGPro install has an edge case it fails on for the older sequence.  It can, however, also happen of the sequence file has been corrupted.  In most cases, however, SGPro will still open and will just present an error message.  This issue describes a condition in which the attempt to load a sequence causes a hang at startup.  Keep in mind that this is just temporary in order to troubleshoot SGPro... DON'T ACUALLY DELETE YOUR SEQUENCE


Problem: A sequence fails to load on start

Solution: Using Windows File Explorer, navigate to the location of the sequence file and rename it to something else.  If this allows SGPro to start up, please send us the sequence file and we'll figure out why (and, if possible, modify SGPro to tolerate whatever issue we find). To do this, just start a new thread on our forum and attach the sgf file in question.


Step by Step


  • Using Windows File Explorer, navigate to the location of the sequence file (sgf file)
  • Right click on the sequence
  • Left click on "Rename"
  • Choose any name you want.  With stuff like this, we will often just append the word "Old" to it
  • Keep in mind that this is just temporary in order to troubleshoot SGPro... DON'T ACUALLY DELETE YOUR SEQUENCE






Failure to Load Equipment or User Profiles


Upon starting, SGPro will take inventory of your equipment and user profiles. Normally, if there is a failure to read one of your profiles, it will just be skipped with a message.  There are some cases, however, where this failure might result in a hang (especially when using network drives).


Problem: An equipment or user profile fails to load on start

Solution: Using Windows File Explorer, navigate to the folder location of the SGPro's profiles. If you have not changed it from the default location, you can find them at: 


C:\Users\[your user name]\AppData\Local\SequenceGenerator\Sequence Generator Pro


If you have changed, this location navigate there.  Once there rename the containing folder names "Sequence Generator Pro" to something else. If this allows SGPro to start up, please zip up (compress into a zip file) and send us the zip file and we'll figure out why (and, if possible, modify SGPro to tolerate whatever issue we find). To do this, just start a new thread on our forum and attach the zip file in question.  Keep in mind that this is just temporary in order to troubleshoot SGPro... DON'T ACUALLY DELETE YOUR PROFILES


Step by Step


If you are navigating to the "AppData" folder, note that, by default, Windows marks this as a hidden folder and you'll need to un-hide it first.


  • Using the Windows File Explorer, navigate to C:\Users\[your user name]\
  • Click the "View" tab 
  • Check the "Hidden Items" check box



  • Double click the "AppData" folder
  • Double click the "Local" folder
  • Double click the "SequenceGenerator" folder



  • Once you see the "Sequence Generator Pro" folder, right click it then left click "Rename"



  • Choose any name you want.  With stuff like this, we will often just append the word "Old" to it
  • Keep in mind that this is just temporary in order to troubleshoot SGPro... DON'T ACUALLY DELETE YOUR PROFILES




Bad ASCOM Installation


This should be amongst the last things you try.  It is certainly a possibility, but is also probably the least likely issue described here.


One of the first things SGPro will do is initialize parts of the ASCOM Astrometry package.  If this fails, it will sometimes never return execution control to SGPro and SGPro will hang.


Problem: ASCOM Packages fail to initialize on start

Solution: Completely uninstall ASCOM and re-install using the latest version of ASCOM found here.




Still No Luck


At the bottom of the list with no solution?  Congratulations, you've discovered something new.  We can still help here... 


Problem: Unknown startup problem

Solution: Send us logs and we'll work with you to find the problem.


Step by Step


  • Using the Windows File Explorer, navigate to this folder: 


C:\Users\[your user name]\AppData\Local\SequenceGenerator\



Note that, by default, Windows marks "AppData" as a hidden folder and you'll need to un-hide it first.  To do this:


  • Using the Windows File Explorer, navigate to C:\Users\[your user name]\


  • Click the "View" tab 
  • Check the "Hidden Items" check box
  • Check the "File name extensions" check box



  • Double click the "AppData" folder
  • Double click the "Local" folder
  • Double click the "SequenceGenerator" folder
  • Presumably the latest log file in this folder is representative of your issue.  We'll want to grab that.
  • Click on the "Date Modified" header until you see a tiny "down arrow" in the center above the text



  • The first file ending with ".log" is the one we want.  In most cases, this file will be pretty small and, if inclined you can use Windows Notepad to open that file and then copy and paste the contents into a forum post here.
  • If you don't want to do that, Email the log file support@mainsequencesoftware.com and then start a new forum post here.  In that forum post, describe the issue you see and make sure to tell us that you have emailed us logs so we can be on the lookout.