[TxMt] can't open certain files from my project drawer

hi. In my project drawer, i can click certain files and they open in the textmate editor window: It's a Rails project, model files and other .rb files are OK

but when I click on the files ending on .erb, nothing happens. For instance a file in /app/views/reports/index.html.erb

It doesn't open. The only workaround i can figure out is to use command+T.

Did i unintentionally touch a switch? Am I overlooking something obvious?

I'm absolutely new to Textmate (bought my mac roughly a week ago) so please point me to an obvious answer/link if possible.

/Jesper

PS. my version 1.5.7 (1464)