Hi seosemsd,
Try this:
Performance -> Minify -> JavaScript/JS Minify setting -> uncheck Enable and save.
I was having the same problems with http://konsultpartners.com but I have nailed the problem to the JS minify.
If that specific one doesn’t work I suggest you switch off all W3TC features and then turn them back on one after another, while checking the sites operation after each. (and remember to clear the cache between each test)
Regards
/Håkan Söderbom
Many thanks for the advice!
I tried the plugin however it doesn’t solve the problem with subdomain vs. subdirectory installation.
As Andrea recommended, I ended up having two separate WP installations, i.e. I added a new network with subdirectory setting. Works quite neatly. It means one more administration point but it isn’t too bad.
Thanks!
/Håkan