Try renaming the .IPGControl.* files under the 'C:\Users\UserName_Folder\' folder path. This typically involves the files .IPGControl.rc and IPGControl.sessions.

How?

• First, double check to ensure that no previous IPGControl sessions are open.
• Now rename the above-mentioned .IPGControl.* files (or even move them to a different location)
• Then start IPGControl again. Does it open successfully ?
• Closing IPGControl should now cause new .IPGControl.* hidden files to be freshly generated.

Why?

• Every time IPGControl (or IPGMovie, Instruments, etc.) are closed, these hidden configuration files are stored based on the user preferences, settings, etc.
• Usually, during a startup, the IPGControl reads these files to reload settings from the past.
• This point is valid irrespective of whether the IPGControl was started from CM GUI or directly from the installation path (e.g. using cmd prompt)
• This loading from the IPGControl hidden configuration files can in rare cases caused some problems if the files have been corrupted for whatever reason.
• Just renaming these files to e.g. .IPGControl_old.* or even relocating them to a different folder typically resolves the error in past instances.
• If these files are not present, IPGControl just creates a new plain version of the files.