After Effects opacity issue (fade in, transformation etc) showing visual errors

[Anderson5CA8]

I don't know what caused this, I was using AE normally these days and now this bug just happened and I tried lots of thing to fix it:
1 - using the Purge option to clear everything
2 - Project Settings > Color set to default again but it doesn't fix 
3 - tried using Transformation, Fade-In etc instead of simply changing the opacity, but they get the same visual error

I uploaded a picture showing the preview in AE, it shows lots of weird bars appearing when it was supposed to be somewhat transparent ...

[Anderson5CA8]

Ah, I just discovered that the Adjusment Layer somehow cause that bug. So here comes the second issue, how do I use Adjusment Layer without causing this problem? For this video I can just delete it and put the effect as it is just a single file, but what should I do when there are multiple video layers where using  Adjusment Layer would be more simply than putting the same effects in all layers?

[Rick Gerard]

What are you using the Adjustment layer to do? Generally, Adjustment layers should be used for Color Correction or blur and glow effects. Just about anything else should be applied to layers with pixels. 

If you can share the modified properties of the adjustment layer (press 'uu') and maybe we will have a suggestion that will fix the problem. 

[Anderson5CA8]

I am adding Unsharp Mask, Brightness & Contrast and Hue/Saturation to the adjusment layer. Weird thing is, that I am quite sure I made lots of videos like this and never had an issue related to opacity but now it happens

[Rick Gerard · Accepted solution]

I am not sure what is going on in the problem comp because you have not shared the modified properties of the whole timeline. Some of the most likely causes of odd random rendering problems can start with GPU driver issues, including amateur or variable frame rate MP4 or inter-frame compressed (IBP H.264) footage in the timeline or a lack of system resources caused by effects that eat up ram. Sometimes resources problems can be solved by modifying the Media & Disk Cache and/or Memory & Performance settings in Preferences.  I always have an even multiple of 4GB of ram assigned to other applications and reserve a minimum of 10% memory to other apps. If I have render problems, I try allocating a little more memory to other applications instead of allocating more to After Effects because I think that something running in the background may contribute more to fouled-up frames than AE running out of memory.

[Anderson5CA8]

I forgot to check back the thread because of work, I ended up deeleting the resources of the project after I was done with it. But next time I will try checking footage type, I have 32gb GB MRAM of 3200mhz so I think it's not much of a problem and I leave like 8gb for other programs