Hi,
I recently eliminated all dependencies on RSS.NET.dll but I guess I forgot to remove the reference form the 3.5 .NET version of mojoPortal.Business.WebHelpers.
I've corrected that and committed my changes to the repository, so you should be able to pull changesets and then do update to get the latest and that reference should be gone, you may need to revert changes first since you removed the reference yourself.
Before you publish make sure you change to release mode by choosing the Release build profile and rebuild the entire solution, f5 is not going to compile everything and for publishing you want to make sure everything is compiled and use a release build.
Thanks for letting me know about the lingering RSS.NET reference and hope this gets you back on track.
Best,
Joe