I haven't noticed any issues with the Daily Email or PTC task recently. For those, I would suggest the trying the following to rule out issues on your computer causing the problem:
1. Clear your browser history/cache - if you haven't done this in a while, perhaps there's a bad/incomplete address in the cache causing problems. I recommend the tool CCleaner - use the free version, it's a very useful tool I've used for years.
2. Ensure your browser is upgraded to the most current version - if your browser is not set to auto-upgrade, that could cause problems. Only exception might be for IE - I found that browser just keeps getting worse over time and stopped using it for personal reasons long ago. If you are using IE10, upgrade immediately - that was is the most buggy of the IE browsers. If you are on IE11, you might want to try updating your settings to default to "compatibility mode" - the IE browser has made propriety updates to only interpret sites based on some strange new "standard" Microsoft is trying to make popular - as a result, if sites are not using their new non-compliant HTTP code sets, the site will not render properly unless viewed in compatibility mode.
3. If you are using IE and cannot get it to work, try a different browser. The most popular are FireFox and Chrome. If you are using one of these, ensure you are using the latest version.
4. Ensure your Adobe Flash plug-in is up-to-date. If you have an out-dated version of Flash, that could cause issues with these activities as they rely on Flash heavily.
Hopefully these tips will help get the Daily Email and PTC working for you again.
For the videos, those come from different 3rd party sources. From my experience from those sources, be aware that some of those 3rd parties are not that fast to clear viewed videos from your queue - so if you watch it once, it stays in your queue instead of being removed. When you encounter those videos, just hide them from your FC list so they won't bother you again. They may come back the next day, but hide them again. It could be possible some of the issues might be a change in the 3rd party's API causing the video not to launch correctly, but from my experience, most of the issues are stemming from the 3rd party site itself, not FC. Best thing is to just ignore the problem videos for a few days and try them again later. Sometimes they get fixed when the advertiser is contacted and fixes a bad reference in their video URL or something. There's really nothing FC can do to fix them - it's up to the 3rd party providing the video to resolve the issue with their advertiser.