I have this issue as well - occured with the previous patch, which also led to the released players issue, didn't go away in the hotfix. I was at the start of the offseason at the time and am still in the offseason, now after free agency filings. I've been playing on since the hotfix in hopes it would fix itself but to no avail. So I've been trying to shop players from November to January 1st. No dice.
I'm running a fictional league that's been going for 70 years. I won't get any offers, even for my majestic diamond-encrusted platinum studs - the game doesn't even seem to
calculate at all. I'm also at "None", equivalent to roughly -7 million, available money for Free Agents, though I just gave myself 40 million in cash and it didn't fix it.
This seems to be an issue that
only affects (some) leagues that were updated from the old version somehow, as starting both a MLB Quickstart as well as a fictional league
created from the template I used for my currently broken one will result in a
working shop a player feature with my game.
I'm not 100% if the settings of my fictional league are identical to those in the template (70 seasons is a lot of time) - but I think in all relevant aspects it ought to be the case.
I'll send you my file if you think it might help!
EDIT: Stop the presses - I got the Shop a Player feature to work again!
I was sloppy before when I added cash - I tried a player again that I had shopped before on the same day, so the game simply reused the old calculations. If I do, in fact, get my money (via cash or budget adjustments) back up to where I have a positive Available money rating, I get Shop a Player results again.
It seems that if you don't have any money available, the game will dismiss the notion that you could afford
any trade out of hand - including the ones
that would improve your salary situation or leave it unaffected. For instance, at 4 million Available Money for Free Agents, the one offer I get for my $16 million salary first baseman is a $15.8 million one - but I don't get
any if I'm at -6.5 million, including that one,
even though it would help bring down my payroll.
Basically, if you're at "None" in Available Money for Free Agents, you can no longer shop players. (You
can still make trades that wouldn't increase your payroll, if you do them manually. Did plenty during this offseason. So I doubt this is intentional behavior - given that financially beneficial trades are just about the
only way to get out of a bloated payroll other than just DFAing and hoping someone bites.)
I was able to reproduce the issue in the MLB Quickstart, too. Do you have a testing save for a financially destitute team?