We were running UR5, updated to UR6 and then UR 13.
We had issues converting leads when duplicate rules were set for Leads -> Accounts, however someone said they thought these had been fixed in later URs.
Installed the updates, and now we get many errors when attempting to convert. My suspicion is that our conv_lead.aspx file did not fully update (as these are script errors - I can't believe these would pass QA).
Can anyone who has access to a working current conv_lead.aspx file please upload the contents somewhere so I can compare it against ours and move on in the diagnostics process?
(I will give the diagnostics tool a try ASAP)