When you are trying to upload an image it will say that it has been uploaded successfully but it shows a red x mark on IE, or not showing any image at all on Firefox.
To resolve this you will need to set the codepage to 1252 in shopa_uploadfilepop.asp.
Directly after the line:
shopcheckadmin
Try adding the line:
Session.CodePage=1252
If you are using ASPJPEG Add-on then you will need to modify shopa_uploadfilethumpop.asp and shopa_uploadthumbpop.asp
Directly after the line:
shopcheckadmin
Try adding the line:
Session.CodePage=1252