Change Element Attributes Tool Problem - Sets element to Default Level [SS10]

BEHAVIOR

Using the "Change Element Attributes" tool with specific library attributes changes any/all elements to Default level & ByLevel settings. SS10 is out of support and I'm looking to understand, resolve, and prevent this behavior from reappearing. (Attached example screen recording.)

CONTEXT

This user (mainly remote) experiences this behavior both while working remotely (RDC) and also in office. This is the only user that reports this behavior.

ATTEMPTED FIXES

  1. Checked if it is specific to one file or a particular project.
    1. The user has this issue across all project configurations.
    2. Other users do not have this issue within the same files and projects.
  2. Deleted existing user preferences.
    1. "Worked" the first time. It did not work when this behavior returned.
  3. Deleted "C:\ProgramData\Bentley\PowerGEOPAK\8.11\"
  4. Reinstalled application.
    1. The issue reappeared.

SOFTWARE
PowerGEOPAK 08.11.09.918

SPECIFICATIONS
Dell Precision 3630 Tower
OS: Windows 10 Pro; Version 21H2; OS build 19044.1766
CPU: Intel Core i7-9700 @ 3.00 GHz, 3000MHz (8 Core, 8 Logical Processors)
RAM: 32 GB, 2 x 16 GB, DDR4, 2666MHz, DIMM
GPU: NVIDIA Quadro P2200 w/5 GB GDDR5X
STORAGE: M.2 2280 512GB, PCIe x4 Gen 3 NVMe 1.2.1