I recently got AE CS5. When I had CS4, i would always render it as a Windows Media File (.wmv). But now in CS5 when I render it as that, it just messes up. The size of the finally rendered HD clip will be no more than a few hundred KB's, and sometimes won't even play. Any suggestions?
Provide more details about your settings, which version of Windows and where you are storing the file. CS5 being 64bit, there could be any number of issues caused by the differences of 32bit vs. 64bit, including some very rudimentary Windows stuff not related to Adobe....