[lpetrich]

You could try displaying markers.xml in your web browser: <forum root address>/markers.xml

That will show what your browser "thinks" it is, and perhaps purge the browser's cached version of markers.xml

I remember editing it once, but some time after that, it got some bad image links again, so markers.xml may be created from the database. I think that it gets periodically re-created by vbGoogleMap's cron job; it also gets re-created after an entry creation or edit.

So you could go to
Admin CP > Vbgooglemap ME > ME Full View

and edit the possibly-troublesome entries, using markers.xml as a guide. By the time you read this, that cron job had likely restored markers.xml to the database value; you can run it again by going to
Admin CP Scheduled Tasks > Scheduled Task Manager > Googlemap ME Cron

and pressing "Run Now".

The two vbGoogleMap data tables in the database are:
googlemapme
googlemapme_settings

So you can try deleting those if you get desperate.