I am also having the same problem as Callinon. It only started recently with patch 1.11 and never had the problem before.
I cleared my cache, updated java, reopened firefox and instantly went to here and it's not letting me go to a higher tier in the talent calculator.
When looking at the error console of firefox I seem to be getting 1 error and a whole lot of warnings.
This is the error I get:
Timestamp: 2-11-2012 18:01:13
Error: SyntaxError: XML can't be the whole program
Source File: http://mb.zam.com/mb/b?s=1663&size=25&id=7562673284248188944&tr=http%3A//rift.zam.com/en/stc.html%3Ft%3D00___&pc=rift%20ZAM%20Other&ri=120&wrap=jspure
Line: 2
And this are a couple of examples of the warnings (there are well over 100 warning from just going to the cleric tank calculator selecting justicar in the middle soul and putting 5 points in the lowest 2 talents):
Timestamp: 2-11-2012 18:01:13
Warning: Expected declaration but found '*'. Skipped to next declaration.
Source File: http://zam.zamimg.com/rift/c/site.css?181
Line: 898
Timestamp: 2-11-2012 18:01:13
Warning: An unbalanced tree was written using document.write() causing data from the network to be reparsed. For more information https://developer.mozilla.org/en/Optimizing_Your_Pages_for_Speculative_Parsing
Source File: http://rift.zam.com/en/stc.html?t=00___
Line: 38
Timestamp: 2-11-2012 18:01:13
Warning: Error in parsing value for 'background-position'. Declaration dropped.
Source File: http://zam.zamimg.com/c/tooltips.css?5
Line: 122
Timestamp: 2-11-2012 18:01:13
Warning: Expected declaration but found '*'. Skipped to next declaration.
Source File: http://zam.zamimg.com/c/tooltips.css?5
Line: 440
Timestamp: 2-11-2012 18:01:14
Warning: Unknown property '-moz-outline-style'. Declaration dropped.
Source File: http://www.facebook.com/plugins/like.php?href=http%3A%2F%2Frift.zam.com%2Fen%2Fstc.html&layout=button_count&show_faces=false&width=450&action=like&colorscheme=dark&locale=en_US
Line: 9
Timestamp: 2-11-2012 18:01:14
Warning: Selector expected. Ruleset ignored due to bad selector.
Source File: http://www.facebook.com/plugins/like.php?href=http%3A%2F%2Frift.zam.com%2Fen%2Fstc.html&layout=button_count&show_faces=false&width=450&action=like&colorscheme=dark&locale=en_US
Line: 5
Timestamp: 2-11-2012 18:01:14
Warning: Use of Mutation Events is deprecated. Use MutationObserver instead.
Source File: chrome://wrc/content/overlay.js
Line: 1105
Timestamp: 2-11-2012 18:02:10
Warning: Expected declaration but found '*'. Skipped to next declaration.
Source File: http://forums.riftgame.com/css.php?styleid=1&langid=1&d=1349108555&td=ltr&sheet=bbcode.css,editor.css,popupmenu.css,reset-fonts.css,vbulletin.css,vbulletin-chrome.css,vbulletin-formcontrols.css,
Line: 299
Timestamp: 2-11-2012 18:02:10
Warning: Expected end of value but found '424b89'. Error in parsing value for 'border'. Declaration dropped.
Source File: http://forums.riftgame.com/css.php?styleid=1&langid=1&d=1349108555&td=ltr&sheet=bbcode.css,editor.css,popupmenu.css,reset-fonts.css,vbulletin.css,vbulletin-chrome.css,vbulletin-formcontrols.css,
Line: 1131
Timestamp: 2-11-2012 18:02:10
Warning: Expected end of value but found '%'. Error in parsing value for 'background'. Declaration dropped.
Source File: http://forums.riftgame.com/css.php?styleid=1&langid=1&d=1349108555&td=ltr&sheet=attachments.css,forumbits.css,forumdisplay.css,postlist.css,projecttools.css,threadlist.css,usercp.css,postbit.css,private.css
Line: 1440
At the end this is what the talent calculator looks like for me:
http://i.imgur.com/9SmPM.png