Some people have also found this useful to correct the intermittent issues logging into the Forum:
If you are continuing to experience issues logging into the Forum, please perform the following steps:
Windows Users: Here are a few thoughts:
Clear IE cookies. Win users have a directory that holds one or two files you can delete.
It is here for 2015: C:\Users\AppData\Roaming\SketchUp\SketchUp 2015\SketchUp
Delete cookiejar.xml and session.dat if you have one or both of them. Please let us know your results.
Mac Users: You “must” clear cookies in Safari, even if you have never used Safari. Safari is what SketchUp is using. Be sure to clearyour Safari cookies if you can’t login to the Forum or SketchUp through the SketchUp client. Also, test Safari. If you have trouble clearing User Data, just open a New Private Browsing window (in older Mac versions, it’s under the Safari menu; in newer versions, it’s under the File menu). That essentially clears things for that session. Caveat: Remember to turn Private Browsing off, too. Please let us know your results.