Update error with cck image field

I'll come back later with more information but as I am in a hurry and wanted to let people know about potetial errors here is a quick description of the problem I am facing:

After upgrading Meta tags module to 5.x-1.6 I got an error on some cck nodes where data was entered for cck image fields at / title tag.
This is how the errors looked like (only thing displayed - no template):

Parse error: parse error, unexpected T_STRING in /.../htdocs/MyURL/sites/all/modules/nodewords/nodewords.module(812) : regexp code on line 1

Fatal error: preg_replace() [<a href='function.preg-replace'>function.preg-replace</a>]: Failed evaluating code: myImageTitleTag in /.../htdocs/MyURL/sites/all/modules/nodewords/nodewords.module on line 812

Research in the db showed that in every node where data had been entered for title or alt tag (not sure which atm) of attached images couldn't be displayed or edited anymore.

This error is probably related to:
#178307 : Handling of ALT attributes

Can't say yet if the error is likely to happen to alot of sites using cck or if it is part of some strange template coding on my site. As soon as I have time for more research I'll get back to the issue and in the mean time if Robrecht Jacques or someone else wants to look at the site/code please contact me via contact form.

Sebastian