I've had issues as well and here are some of the things I've tried that helped me get the post to go through:
-Compress video with program 'Handbreak' - try to keep videos under a gig
-make sure your thumbnail is under 1MB
-let video complete uploading before adding thumbnail and info
-clear cookies before uploading
-if one browser doesn't work, try another: chrome, IE, firefox (firefox has been working for me)
I wish you luck!!
Thanks, man! I appreciate it! Hopefully it'll help and I can get back to uploading on here and maybe make some money from real fans with faces and bodies instead of the spam accounts that are subscribed to me on youtube.