Anyone else having issues with Note Board Web Part not accepting new posts after April 2013 CU? On existing pages with Note Board Web Part, posting new message gets stuck to "Waiting...". When creating new page and adding Note Board WP to the page and posting new message, I get error "There was an error processing this request. Please refresh this page."
I can add new note through Tags&Notes --> Note board, and I can also modify/delete existing notes using the Note Board Web Part. Only adding new note from Note Board Web Part is not working. If I create new site, it works, it's just this one site collection root site where it's not working (also occurs on new pages in this Pages library). Also if I disable Security Validation for the web application in question, the Note Board Web Part starts working.
CU upgrade itself went smoothly.
I believe this ULS section refers to the error, as the RTEContents contains the string I'm trying to post to Note Board Web Part:
04.11.2013 17:29:51.51 w3wp.exe (0x27B8) 0x1414 SharePoint Foundation General 8kh7 High The security validation for this page is invalid. Click Back in your Web browser, refresh the page, and try your operation again. b4ae2305-aeb1-47b3-9133-271a8f420e5c
04.11.2013 17:29:51.66 w3wp.exe (0x27B8) 0x1414 SharePoint Foundation General 8kh7 High Stack trace: onetutil.dll: (unresolved symbol, module offset=00000000000A22A1) at 0x000007FEEF1E22A1 onetutil.dll: (unresolved symbol, module offset=00000000000A3461) at 0x000007FEEF1E3461 owssvr.dll: (unresolved symbol, module offset=0000000000009256) at 0x000007FEE7449256 owssvr.dll: (unresolved symbol, module offset=000000000002B6F0) at 0x000007FEE746B6F0 mscorwks.dll: (unresolved symbol, module offset=00000000002BCD67) at 0x000007FEF972CD67 Microsoft.SharePoint.Library.ni.dll: (unresolved symbol, module offset=00000000000E22D5) at 0x000007FEE8CE22D5 Microsoft.SharePoint.ni.dll: (unresolved symbol, module offset=0000000001AF4182) at 0x000007FEEC4D4182 Microsoft.SharePoint.ni.dll: (unresolved symbol, module offset=0000000001AA30A7) at 0x000007FEEC4830A7 b4ae2305-aeb1-47b3-9133-271a8f420e5c
04.11.2013 17:29:51.68 w3wp.exe (0x27B8) 0x1414 SharePoint Server Social Data xppp Medium argument:<Item type='Add'><Title>test</Title><RTEContents>fsdasdfsdfdsf</RTEContents></Item>,message:The security validation for this page is invalid. Click Back in your Web browser, refresh the page, and try your operation again.,request:<Item type='Add'><Title>test</Title><RTEContents>fsdasdfsdfdsf</RTEContents></Item> b4ae2305-aeb1-47b3-9133-271a8f420e5c
Any ideas how to start troubleshooting this? Why can it suddenly start giving me this error? Any debugging ideas are appreciated I cannot think of anything more to try...I cannot really recreate the site even, as it is site collection root, so what could I try?
UPDATE1
Forgot to mention, if I use Fiddler to look at the triggered javascript call (when posting new note board comment), I can indeed see it gets a OOB error page saying: "The security validation for this page is invalid. Click Back in your Web browser, refresh the page, and try your operation again.".