I've been working my way through TUF s05 on the streaming section.
Eps 1-4 work fine but 5, 6, 7, 9 don't but 8 does.
I have all the requried plugins/codecs.
When I click play on the said episodes it just stops on "Buffering 0%" then never plays.

Hi mate.

They are all working for me.

Try cleaning cashe or in worst case, reinstall the plugin.

It seems your is stuck at an earlier download not finished or so.

12:50:02 PM ip xx.xx.xx.xx Requested GET /The.Ultimate.Fighter.S05E05.DVDRip.XviD-W4F.avi
12:50:02 PM ip xx.xx.xx.xx Requested GET /The.Ultimate.Fighter.S05E06.DVDRip.XviD-W4F.avi
12:50:02 PM ip xx.xx.xx.xx Requested GET /The.Ultimate.Fighter.S05E06.DVDRip.XviD-W4F.avi
12:50:02 PM ip xx.xx.xx.xx Requested GET /The.Ultimate.Fighter.S05E07.DVDRip.XviD-W4F.avi
12:50:02 PM ip xx.xx.xx.xx Requested GET /The.Ultimate.Fighter.S05E07.DVDRip.XviD-W4F.avi
12:50:02 PM ip xx.xx.xx.xx Requested GET /The.Ultimate.Fighter.S05E08.DVDRip.XviD-W4F.avi

It looks like you are trying to get several episodes simultainesly and plugin is problably going nuts (I removed your ip)

Hope you can fix it!