Lightroom 5.4, 5.5 and now 5.6 develop module not processing changes made on pictures

Has anyone come across this annoying bug from Lightroom yet? if so how did you solve it, workaround also welcome, it's doing my head in now. Been here for weeks now with all jobs sitting on my desk waiting to be processed but lightroom NOT working as it should
Version 5.4 never had this sort of issue and when upgraded to 5.5 all seemed to work fine up to 3 weeks ago when i though my PC was the culprit, uninstalled - deleted reg keys and clean registry hives from any LR entries yielded NOTHING upgraded to 5.6 same completed the same tasks on two other laptop with Win 7 and Win 8 NOTHING.
I'm  on Windows 8.1 any similar photo editing tools will be appreciated, getting fed up with these dudes now.

Thank you for reply Rikk Flohr and sorry if had not been clearer enough.
I have been experiencing for more than a month now, I was hoping the latest V5.6 will nurse for me but instead another disappointment.
Scenario:
- I upload pictures into Lr and click on Develop tab.
- I make some extreme exposure/contrast/etc adjustments (to the left or right) nothing happens on picture in the main window but instead to the one in the timeline section
Troubleshooting do so far:
- Uninstalling and cleaning the registry then reinstalling (on more than one PC)
- Uninstalling V5.6 and installing earlier versions 5.5 then 5.4 no yield.
- Try the suggested link (Resetting (or 'Trashing') the Lightroom Preferences file - Lightroom Forums) advise, same result.
I'm really HOPING you guys can fix this issue as I have jobs piling up in my hard drive to be processed on the daily basis.
Will appreciate if you could advise on all directories to look at when clearing Lr registry entries on both hives of the PC, I'm on Windows 8.1 x64 with all the latest updates

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