TiddlyDesktop won't show; gives InitializeSandbox() error

[ZeroKobold]

Hello,
Been using TiddlyDesktop (release fifteen) on Ubuntu Linux for a while now, and it stopped working all of a sudden.
I used to get plenty of messages in the terminal window when launching ./nw, but TiddlyDesktop still opened and did its job correctly.
Recently, after shutting down my laptop and bringing it over to a friend's, the TiddlyDesktop window just does not appear.

In addition, I'm getting fewer messages in the terminal, with only these three lines:

[715427:715427:0307/154636.520820:ERROR:sandbox_linux.cc(376)] InitializeSandbox() called with multiple threads in process gpu-process.
[715435:715464:0307/154735.046727:ERROR:cert_verify_proc_builtin.cc(601)] No net_fetcher for performing AIA chasing.
[715435:758922:0307/154735.046838:ERROR:cert_verify_proc_builtin.cc(601)] No net_fetcher for performing AIA chasing.

Originally, nothing had changed as far as the computer was concerned.
In an attempt to fix the issues, I've recently updated Ubuntu as well, so I find myself on 21.10 instead of 21.04.

I tried a few other releases just on the off chance one might work, but to no avail. I do get different error messages with those however.

I've tried Googling my way out of the situation, but I can't seem to find anything that works.
Any help is appreciated! Thanks!