Youtube 360p buffering/preloading fix

You must have noticed that Youtube has changed the way videos load few months ago. They load some time, and they stop if you have paused the video, thus not letting you load the whole video for offline use. There are few ways of fixing that, one of them might do the trick for you.

Deleting the cookies and cache

Try deleting the cookies and cache from your browser, and restarting it. It will also delete your saved login data on every site, but you'll get to load the whole videos from Youtube.

For Google Chrome, go to the Wrench icon in the top-right corner, press History, and click the "Clear all browsing data" button.

For Firefox, go to Tools -> Options, Privacy tab, and click the "clear your recent history" link:

Setting Youtube to never play high quality video

Open the video you want to preload, press the gear button, select 360p, and finally check the "Never play high quality video" option.

Re-install Adobe Flash

Go to Control Panel -> Programs, and find Adobe Flash Player. Delete ActiveX and Plugin, both.
Now, go to their official site, download the newest version, and install it.

Try some pre-loading extension for your browser
Firefox: Youtube Auto Buffer (Needs GreaseMonkey)
Firefox: SmartVideo
Chrome: Magic Actions