It looks like one of four things are happening. The earlier vps might be picking up a false positive,and this was corrected in the latest version. Or the later version might have an up dated detection and is detected the file as infected, though it could be a false positive.
Which vps is detecting the file?
In any case, you should submi the file to virustotal
http://www.virustotal.com/xhtml/index_en.html , it's an online muti engine scanner. If avast is the only one to detect it, it probably is a false positive. If others detect it, move it to the chest. It will be safe there and further investigation can be made.
Please post back the results, no matter what. Welcome to the forum.