Odd. I use @partha’s GIMPs on win7 and I haven’t encountered any problems. Please provide sample JPGs and TIFs. Someone has complained about this in the past few days so you aren’t the only one.
PS That warning window screenshot is huge on my screen ha ha.
Gimp-2.9.6-std is not giving me any problems on win7. However, I have noticed that JPGs and TIFs of photos can take an inordinate amount of time to load compared to PNGs (or XCFs if I remember correctly).
Edit>Preferences>Folders>Plugins should list two directories, one in your own Gimp profile and one in the Gimp installation tree. Do you see them? Do they exist? Are there any file-something executables in either directory?
I am having this problem (GIMP gives an error of ‘unknown file type’ for JPEGS. I see you mentioned executables in the two Plugins directories. I have this. I installed the Resynthesizer plug-in in both paths (it wouldn’t come up from just being in the GIMP installation tree). After that, GIMP stopped being able to open/see .jpg files. Any tips?
Edit>Preferences>Folder>Plugins: you get a list of directories. In out-of-the-box Gimp, one is in your user files, and one is in the Gimp installation. The directory in the Gimp installation should contain many executables with names starting with file-: file-jpeg, file-png (file-jpeg.exe on Windows). If you only see the GMIC executables there, then find the directopry with the file- executables, and add it back to the list.