Using AE CC 2015? Got the bug fix that came out last week? If no, get it.
Still no joy? Got AE CC 2014? If no, get it and use it.
You should not be deleting mask points, you should be moving them. You should've received a warning.
Does it matter if the logo is a PSD or AI file? I was told by tech support that it wouldn't be recognized if it was from Photoshop, and that once I imported the AI file, I had to convert to shapes.
In the end, tech support thoroughly confused me and did more harm than help.
Oh and Rick, I did receive that warning, so I went into General preferences and turned off that setting. Hasn't helped me at all.
If you can animate a mask on a solid you should be able to animate a mask on a Photoshop layer. If you can animate a mask but not a Photoshop layer there may be something about the layer we don't know. If you cannot animate a mask and AE is up to date then try a reboot and a new project. If that doesn't work let us know.
Did several reboots of the programs (AE, AI, PS) since the problems developed... did not seem to make any difference. Double checked that the the Photoshop layers were Smart Objects, and they were originally.
Just kept trying. For some reason when I fiddled with the pen tool settings it seemed to help me, but I had to adjust the mask with every deletion... tried doing the adding of points on the mask and not deleting, but in the end it was the deleting that worked.
I have no idea why the keyframes weren't recognized. I wonder if me turning off that setting in General preferences was the difference, even though it had no effect initially.
In any case, it is working now and I've been able to successfully animate that first layer, and animate the second. Now I'm moving on to the other two layers. Wish me luck, and thanks for your feedback.
That was about 6 hours of lost time. Yay.