Check out the help section on the site. It will give you all the info you need about boosters: http://petrescuesaga.com/help/en You need to buy some gold bars first, use your iTunes/Google account etc, then once you have the gold you can then pick up some boosters.
The level was a changed a little while back. Previously the 2 colorbomb combo would clear the left side but now it doesn't. You need a new gameplan now! check it out here for the new version, clear a few pieces of licorice on the left before using the color bombs. https://www.youtube.com/watch?v=jlHUboywqQo
I haven't seen any information on this site about levels etc yet. But I know that sometimes they post information on the Facebook page for the game. I'm not sure if you're on FB but of course if you are its worth following. Then it will just pop up in your feed! Check it: https://www.facebook.com/CandyCrushSodaSaga?fref=ts
If you're playing on a tablet it could be a memory issue. Try restarting your device, or force closing all the apps, free up a little memory. Give it a try, let me know if it works :)
Did you check out the video that the mods posted here? Sometimes if the games servers are busy the games won't load also. I recommend closing all of your tabs and programs etc. This was my downfall when my games stopped loading. Check out the video though: https://www.youtube.com/watch?v=OESCE4Jj2tU
Hey, I had a little search on Youtube and this was the most recent video that I could find. I hope you can pick up some tips and get past the level! https://www.youtube.com/watch?v=uDDGHeyHvfQ
What level are you on with Facebook, check on your PC/laptop, see if its still on level 171. If so then you only need to keep trying to connect with the in app button and it should come back.
I'm not sure if there's a bug, but if your app is crashing I recommend restarting your phone, closing all the apps etc, basically freeing up the memory so the app can run smoothly :)
I'm not sure, normally the fruits take their time to appear, but they should be there. Have you played the level since, did anything change, let us know!