Hi,
please provide me with answer to this q: You do not see certificate selection popup during recording in WPM recorder or some old recording stops working and it is down ?
If issue is in recording: If WPM does not provide a certificate popup, it is either not installed at all, it is not in user personal store or it does not have Client Authentication OID. Keep in mind that you are running recorder most likely under some other account than accounts, which will be used for actual playback from location.
please describe where your issue occurs more with more details in case that your problem do not occurs in WPM Recorder during recording.