The reason is that you computer cannot properly decode .m2ts files. I'd suggest you to uninstall haali splitter and when installing it back to tick MPEG-PS and MPEG-TS checkboxes.
You can test if it is okay by importing a M2TS file in multiAVCHD and check if you can see preview in Title properties / Transcode. If you have a preview with m2ts files there - you will get the thumbnails, too.
Dean
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