Hi, the SOPs flipsolver node has Checkpoints exposed which is nice, but the file name ends up as cache..sim, ignoring the $SF token. If I edit the flipsolver node and break the connections on the dopnet node, then it starts working, using the exact same name string. What could cause that? Is this actually bug that wasn't caught or is it something on my end? Would be interested in hearing if anyone else get the same issue.

Currently using 19.5.534, was also present in .303.

Edit:
A potential workaround is to change the link on the dopnet node to:
chs("../explicitcachename")+".$SF.sim"

Then it will evaluate it correctly, meaning your top level setting on the flipsolver node should leave out the numbering and file extension part. Maybe it can be forced to evaluate the string correctly some other way that's neater.

yeah I got the same issue and had to solve it same way. hope it gets fixed