Preview Problems

I've used FB to create forms on several sites. However, I've started encountering a couple of problems with one site.

1) While creating several forms within the same site, I kept frequently getting a warning message indicating an invalid character in file:///C:/Users/(username)/AppData/Roaming/Adobe/Dreamweaver$209/Configuration/Shared/WebAssist/Preview/wafb.htm. I always selected Yes when it asks if I want ot continue running scripts on the page.

2) When I now start FB to modify an existing form within that same site that I had previously created using FB, it displays the content of the previous form I was working on, not the content of the current form.

I have deleted the Wincache file (multiple times), but that didn't help resolve either problem. I even recreated the site cache in DW via Site>Advanced>Recreate Site Cache, but that didn't help. I also restarted my computer and that too didn't help resolve either problem.

The problem seems to be isolated to this one site as, as a test, I went back into another site where I had previously created forms using FB and I don't encounter either of these problems when I try to use FB to modify one of these forms.

Any suggestions would be greatly appreciated. I'm sure there is a simple solution. Thanks in advance.