Good I've just reported the same issue under the modpack because I didn't see this here, as it's in the wrong spot... Still no fix. I tried twitch launcher but that thing is serious horsecrap...
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Tech Support section is for getting help with FTB related problems. If there's a repeatable issue that can be labeled as a bug, then please use the issue tracker for the pack or the app at GitHub issue trackers - If there's no repository for a pack that means that the pack is old and/or will not be updated. Bugs for older packs will not be fixed, unless they are critical.
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taken31
Guest
Seems to be back to normal as of today! 
Thanks again for the workaround Flainx, kept me going in the meantime.
~Nate
Thanks again for the workaround Flainx, kept me going in the meantime.
~Nate
Yes this should have been fixed now - If anyone is reading this and still gets the MD5 error, create a new support thread/ticked and provide information, most important - a log.
(instructions for getting a log can be found here: http://support.feed-the-beast.com/faq/ )
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