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epiqmail -
I could be wrong (wouldn't be the 1st time) & I haven't tested the 2 modules you mentioned under SSL but I can tell you that ChatMX works fine under Win2003 / IIS 6. I spent weeks trying to get the Galeria Module to work & had no success - I would instead suggest the you try
myAlbum-P 2.50beta - I know that 1 works like a charm under IIS 5 & 6.
You say you gave full permissions - via the IIS Admin interface or via NTFS? You need to make sure that the IUSR account has read/right/modify/delete permissions (NTFS) as stated in the readme/install files (generally the cache directory).
Hope this helps you out a little - let me know how it turns out.