Error while saving a XPression project

While saving the XPression project we get the attached error message. The “normal” file is saved, but the backup one clearly not. Removing the plus sign in the file path did not help by the way. Anything we could do to solve this (besides making a tilde version manually)?

This happed with XP 11.5 build 5806

That’s a strange one…does the XPression log file have anything about the error?

C:\ProgramData\Ross Video\XPression\XPressionStudioFlex\logs