I have the same problem as you!
Other applications works fine with printredirects, but not Adobe Reader X. I have tried to modify the GPO to disable Remote Desktop Easy Print as i seen on Microsoft forums to try on printing errors, but no luck.
I have checked that the printerdriver seems to be the correct one for the local printer, but it does not matter.
Have you found out anything please let me know.
I don't have any success yet but I will investigate further.
What language do you use for Adobe Reader X and Windows please, this may help.
I'm a French IT guy.
Server 2008 R2 sp1 with RDS and swedish adobe reader x, clients are win7,xp and vista fully updated.
I´m a Swidish IT guy. I´ll try installing previous reader tomorrow.
In fact, all you need to do is unchecking the "protected mode at startup" in Edit/Preferences/General Menu.
Reader X prints fine now : hard to believe but true.
Hope this will help you to, please reply if so.