odd video problem

[songpony]

I just purchased a new laptop and it's been working just fine with Hoster but for one intermittent problem. On occasion, the video of BOTH the preview window and the singer's display will freeze, then slowly fade out, while the audio continues on as normal. Then maybe 20 or 30 seconds later, the words will start appearing again (from the excat point it left off - now well behind the audio), and they will get highlighted and scrolled through really quickly until eventually the video catches up with where the audio is and things then start working correctly. This seems to happen early on in a show, maybe for a couple of songs (not all in succession, necessarily), then seems to be OK for the duration. The other oddity is that it (so far) seems to only be appearing when there's an instrumental break or at the end of a verse - it's never happened right in the middle of highlighting a line, or in the middle of displaying a new set of lines. Note that this is not just the second display - it's the preview windows on the hosting display as well. I'm running Hoster 4.06 and the laptop is as follows:

Compaq CQ60-212US
Windows Vista Premium 32-bit
2.00 GHz AMD Athlon X2 Dual-Core Processor
1MB L2 Processor Cache
4 GB memory
NVIDIA GeForce 8200M graphics
1919 MB video memory

Any assistance would be greatly appreciated.