Can't create new masks if one is already made

[ConnorS1110]

I was using Keylight 1.2 to chroma key out my green screen and I created a mask around the area my film took place so I didn't have to tinker with the settings as much, but now I can add another mask other than the original one I made. When I try to make a new mask it just adds more points to the mask I already have. Also if I delete the mask and make a new one, it lets me add two points and then what I said in the previous sentence occurs. I have the layer parented to a null object as well, but when I unparent it, the problem goes away. Anyone have any ideas why it is doing this? Thanks

[Rick Gerard]

Is this a new problem? Are you new to AE?

Try this: Make sure the original mask is not selected and click away with the pen tool. I would suggest that you type mask in the search help field at the top right corner of AE and take a look at some of the community resources. Here's a quick look at animating masks or shape layer paths:

[ConnorS1110]

Hi Rick,

I've been using After Effects since CS5 so I know my way around fairly well. This is something I've never had happen before and I was trying to find a solution online, but I couldn't find anyone else saying they had a similar problem. I'm pretty sure it has something to do with the fact that I've parented the masked layer to a null object, but I'm just not sure how to work around it.

[Rick Gerard]

Show me your timeline with the modified properties of each layer revealed and give us you system, os and AE version down to the last decimal point. I can't make the mask tool not work the way it should.

[Roei Tzoref]

I recently had similar phenomenon in CC2017 (are you using it too?) with masks. appearntly this was related to hardware acceleration checked on in the preferences->display. Once I set it off everything went back to normal. See if it's related to your case - we may have managed to break after effects and we can report a new bug.

[ConnorS1110]

I don't think this is the problem either the hardware acceleration box is grayed out for me, but it appears to be off. I couldn't turn it off even if I tried to just see if maybe doing the opposite would have any effect.

[Roei Tzoref]

If you Can, reduce this project to just the buggy setup and upload it here through any legit cloud service. I want to look into it.