As promised I've tried to reproduce it on a second system, this time running on a quite fresh installed WinXP SP3-PC ... but I was unable to reproduce it
Because of this I then uninstalled all WeBuilder-Entries in Windows Control Panel - Software (there have been entries from WeBuilder 6.3, 7, 8 and v.9.0RC (=9.0.0.96??!!)) of my old Win2k system and made a complete registry cleanup after rebooting. Finally I rebooted once more and did a fresh install of WeBuilder 2008 9.0.0.96.
After all of this I tried to reproduce the reported bug ... and, what should I say, I made it, meaning that
it still occurs! Finally I went back to the new WinXP system and were able to reproduce it on this machine, too! I think there are two prerequisites for the buggy behaviour to occure:
1. there have to be enough entries in the drop down list of the "search for"- and/or the "replace with"-field thus a scroll bar appears in the drop down list;
2. one of the entries in the drop downlist must be the same as in a prior search/replace-action
Here's an example: My last replace with entry was "../abb/"; now when selecting an entry by mouse or keyboard, i.e. "border="0"", the wrong entry ("<br />") is put into the replace with field