I got the malware warning when I tried to access the second page of the "Help Me Plan My Euro Trip" thread in the Entertainment thread.
Here's what it says:
Raptors Forum | Toronto Raptors Blog & Message Forum contains content from Cekic Apartments, a site known to distribute malware. Your computer might catch a virus if you visit this site.
Google has found malicious software may be installed onto your computer if you proceed. If you've visited this site in the past or you trust this site, it's possible that it has just recently been compromised by a hacker. You should not proceed, and perhaps try again tomorrow or go somewhere else.
We have already notified Cekic Apartments that we found malware on the site. For more about the problems found on Cekic Apartments, visit the Google Safe Browsing diagnostic page.