Old Samsung i9100 Cyanogenmod reinstall/upgrade

I have a Samsung Galaxy S2 (i9100) with the latest Cyanogenmod v11 (Android v4.4.4). A few days ago when I turned it on, I found it had gone silly and lost many applications and settings. I re-run link2sd, thinking it might be the problem, and I did manage to get the apps back. However, it seems that some system settings are lost for good, and there are a few glitches:

- The home key doesn't work in the system UI Trebuchet. No home screen, no process list with long press, etc. The button itself works ok, since it gives vibration as feedback.

- The lock screen security never kicks in, so when the phone goes to sleep it's unlocked, even if I set security to "Pattern" in Settings -> Lock Screen -> Security.

- Some other settings don't work, even if they appear to be set correctly and I keep on confirming them. For example: The notification drawer has disappeared and won't come back again. Some kind of icons won't show up in the notification bar: WhatsApp, SMS etc. There's no extended power button menu even if it's enabled in my preferences.

I thought I'd solve these problems by reinstalling Cyanogenmod 11. I have a few questions.

  1. Can I reinstall the same Cyanogenmod version without a hard reset? Any important piece of advice about that?
  2. Can I switch to Cyanogenmod 12 flawlessly? I am afraid about doing that because I don't want to lose my working recovery. I have CWM-based recovery 6.0.5.1 right now, and I wonder if it's compatible with CWM 12.

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