No, compression is completely turned off.

Ok, interesting. when there's a space in the file name it does not ork (hr newsletters.pdf) but if I make it (newsletter.pdf) it downloads fine.

I am also having trouble with 4.3.5 for the same reasons.

I think that the problem is that the DecryptParameter() function cannot handle the already decrypted % codes in the fileticket parameter. The Encoding process returns characters that need to be URL encoded and IE pre-decodes these when doing the HTTP GET of the URL, and Mozilla does not.

The core team should change the PortalSecurity.vb: Encrypt() function to change from Base 64 encoding (with too many bad characters) to base 36 (A-Z0-9) encoding. We can handle 15 more characters in a URL without having to worry about double URL decoding. Who knows what that will do to backwards compatability.