Freeze on File Dialog Box (Open, Save As..., Export As...)
GIMP 2.10.0 and 2.10.20 freezes up (>4 minutes) when opening a file using the File>Open toolbar option, or using Ctrl+O, for the first time. Eventually it finishes loading the file dialog box for the first time, and then there's no issue opening it again afterward. It seems like a Windows file dialog box issue. I had the program do the same thing when trying to use the Save As... functionality, and I wouldn't be surprised if it happened trying to export too. Also, once I select File>Open and let it eventually unfreeze itself, I can then open the save dialog box and export dialog box without a problem too.
I'm running Windows 10 64bit, build number 19041.388, experience pack 120.2202.130.0
I've been using GIMP for a year or more on the same Windows 10 system, and never experienced this before until this week. I did recently update Windows 10 to the latest available version (2014) given me. I suspect it could have something to do with it.