I discovered this on a goof. On my laptop I had installed the latest version of WinAMP to listen to MP3s and so on and it had associated itself with FLV extensions (I just did a standard install that auto-associates instead of a custom which it why it happened).
I downloaded a few FLVs as backups from my YouTube channel and double-clicked one to view it – and whammo, up pops WinAMP and plays the video.
Said honestly, yes, this is the best FLV player I’ve used. I was previously using FLV Player to view these files but now I can just use WinAMP instead. It does the job far better than using another app and full-screen works perfect.
If you’re stuck on which to use for a quick’n'easy FLV player, use WinAMP. Works great.

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Won’t VLC media player also play .flv files?
Yes, VLC does FLVs. I just like WinAMP better. Personal preference.
I use Widows Media Player Classic to flv and its perfect
There are so many free flv players, and at the point of writing this I am in the process of looking for a good one. Unfortunately, despite trying many, I’m still not satisfied. I can say for certain that Windows Media Player Classic is NOT good at playing flv files downloaded from Youtube. Try playing it in full-screen mode and it looks like the picture is melting. Now compare that with full-screen mode of the same video on Youtube. Youtube quality wins every time – smoother, more stable.
FLVPLAYER is another example of poor quality, but this time it’s pixellated and tends to stress the processor in full-screen mode, leading to stuttering. Prone to poor AV sync. Very buggy. It comes in various guises, including Aunsoft.
VLC Player – another one with poor ‘melting-effect’ quality in full-screen mode.
Sothink FLV player – similar poor quality to Media Player Classic but lacking control options.
Following the suggestion here about Winamp, I tried it (v5.55). How could you recommend this cluttered piece of bloatware? I selected full-screen mode and got the small picture in top left corner. I right-clicked to increase the size but could only get it up to half of full-screen size and I had to shut the whole program down to get back to the desktop! Terrible! How the hell can something have been around so long and be so buggy?
Before recommending a media player I suggest you try it in full-screen mode first.
I have absolutely no issues with full-screen video using WinAMP, nor do I have any of the issues you mentioned; they seem to be exclusive to your computer.