@IGHOR
Something I noticed:
If I set rules as such:
MLP>$7.7 ask NMC 0.1 $7.7
MLP>$7.75 ask NMC 0.1 $7.75
MLP>$7.8 ask NMC 0.1 $7.8
etc x 8
and the reverse in a rules group for buys and run them in concurrent mode, quite often things seem to hang up and nothing further will happen.
If I had to take a guess, what it appears to be doing is this:
MLP jumps from 7.5ish to 7.8ish, and the 7.7/7.75 rules get skipped, probably because the 7.8 rule is appropriately determined to have the ball. However, because the 7.7/7.75 rules never executed, neither will the 7.8 nor anything further, until MLP gets back down to the 7.7 rule's domain.
Again, that is a guess as to the cause, and not a terribly educated one. Just seems to have been the case each of the times I've sat and watched it occur.
This is the case on a Phenom 9150e quad with 8G RAM (only 3.5G avail due to 32b without PAE ATM), Porteus 2.1 Linux, if any of that matters.
edit: In fact, as I was typing this, it did it to me again. Missed the first two rules, and I had to manually create several sell orders at 7.75-7.8ish prices to get done what the series of rules should have...