On the configuration document, Maximum Image Upload Size (MaxUploadSize) should probably default to a number (either 0 or something reasonable). If it's blank (which is the default) or if it's not a number, users will get the following error when trying to upload images:
An error occured…
HTTP Web Server: Lotus Notes Exception - Comparison operators must be supplied two values of the same data type.
On a related note, after that is changed, the line:
Error := @If ( FileSize > FileSizeMax ; "text_uploadmaxsizereached" ; "");
in the Input Validation section of the UploadMaxSize field on the UploadWeb form (which is where the error above is occurring) should probably be changed to:
Error := @If ( (FileSize > FileSizeMax) & (FileSizeMax > 0) ; "text_uploadmaxsizereached" ; "");
Otherwise, you get an error trying to upload any image file when MaxUploadSize is set to zero.