I just tried to see if this error occurs on 4.6 on staging but I couldn't figure out how to replicate it there - are there more instructions? Or does just searching in 4.2/live cause this error?
Here's some text to paste into the prospect panes (use the source editor), which will reproduce the bug:
- Added an Activity: Type: Meeting to record 96103. In the description copy-pasted one full page of bulleted text from a google doc. Save successful
- Added Activity: Type: Contact - Fundraiser Initiated to record 10617561. Typed content into description, including two bulleted items. Copy pasted 2 URLs. Save successful.