Just last week I downloaded the forums module and installed it.  I was testing it all day today and could not get a file attachment to upload successfully in order to attach it to a post.  After troubleshooting all day, it appears that you have to set the 'Max Attachment Size' to 0 in the Forum Configuration under Post Attachments.  Otherwise it will only let you upload a zip file.  I also had to add an entry to the DesktopModules\Forum\App_LocalResources\Shared_Resources.resx file, I added the following:

<data name="ExceedFileSize.Text">

<value>File exceeds size limitation, please select a smaller file!</value>

</data>

I suppose that this may not be the right answer but after searching the internet for quite some time, I decided to look at the code myself.  If someone knows the "right" answer to this, please let me know. I am a little concerned about setting the file size to "no limit" essentially, but our user base will not want to zip something up before trying to upload it.

I recently upgraded my site to the newest verion of DNN, and also upgraded both my Forums and Gallery modules.  I was hoping the avatar not showing would have been fixed, but it does not appear that it has been.  I was previously able to give a user an avatar by logging in as admin and assigning them an additional avatar, but I only did that for my normal user account.  Since I upgraded however, I have not been able to even do that, and have in fact lost my admin assigned systemavatar. 

Obviously having avatars is not an end all requirement, but it would be nice if the Forums and Gallery would integrate better than they currently do.  Since that is the idea.  Anyway, just curious if there were any updates on this issue.