I have $X million in various stocks, no cash, no margin used at all. Net Liq shows the same $X -- same as Equity With Loan. "Buying Power" shows as $5X which is what I'd expect.
The cash withdrawal limit is an odd number like $507,642.18 and I have no idea how that number is calculated, as it's not a multiple of anything else.
As far as I can tell, the issue is because I recently created and funded my account (~1 week). Maybe there's some sort of cooldown period. Can someone confirm, with a portfolio of $X, a ballpark figure for what you'd expect for "Cash Available for Withdrawal (assuming margin loan)"? I was expecting >$2X.