Please contact UserEcho support: http://feedback.userecho.com/

Yep, 32 GB sounds like enough.
In v4.5.5 of the tweaker, I've updated the MinHook library to a newer version.
Could you try an older version (e.g. v4.5.4) and see whether the issue still occurs?
You can get it here:
https://www.dropbox.com/sh/mcbychsh0xc1dvu/8-Lj2sg3NP

The error happens in the MinHook hooking library which the tweaker uses, and error code 9 is MH_ERROR_MEMORY_ALLOC, which means that the library could not allocate the required amount of memory. Could a limited amount of system memory be the issue here? Also, are you using a 32 or a 64-bit system?

You're right. Seems like it's not new. I'll look at it.

No problem, it's not something a screenshot cannot fix :)

OK, I believe that I could reproduce it, and probably fixed it.
Please try the following version:
https://www.dropbox.com/s/64c32kbcw75hzvw/7tt_setup_beta_v4.5.6.4.exe?dl=1

Unfortunately, I could not reproduce it.
If you'll be able to come up with exact reproduction steps, please let me know.

Here's a debug version:
https://www.dropbox.com/s/oyth5yaqzv4rlnz/7tt_setup_debug_v4.5.6.3.exe?dl=1

When run, it should create a file with the name _DEBUG.LOG on the desktop. Please reproduce the error, and post the contents of this file. Thanks.

OK, so you're talking about the Taskbar Inspector. The 7TT (or 7+ Taskbar Tweaker) window is this.
I'll try to reproduce it.

7tt has a vertical scrollbar

Are you talking about the taskbar? 7TT does not have a scrollbar.

All in all, I'm not sure I understand your issue. Could you please provide a screenshot?