Some strange problems with ram usage

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My PC is P4 2.8Ghz 1gb ram and 6600GT,I run PPSSPP on Windows XP x86...I know it's old and weak but the speed is not the problem(I get full speed and more(250+)on almost every game I tried)

This my first time using this emulator(actually any PSP emulator)and I have some strange problems.

1.On every game I try,if Buffered Rendering is enabled,I get black screen(the game is running fine,it's like Buffered Rendering is acting as show\give the game,replace it with black screen)

2.On almost every game if Hardware Transform is enabled(sometimes happens even if I just start the emulator),it start eating all of my remaining ram(more than 700mb)and when it uses it all,it continue with the remaining pagefile space.

If I try to close the emulator when that happens,I get a msgbox with this

Code:

Wait for emuthread timed out! :(
please alert the developer to possible deadlock or infinite loop in emuthread!

and it's really hard to kill the process when that happen(I have to use Process Hacker=>Terminator=>
Sets the page protection of the process' memory regions to PAGE_NOACCESS
to be able to kill the process.

If I disable the pagefile,then when it uses the last mb free of my ram,it returns to lower usage and the game continues normally otherwise(with pagefile enabled)I get a black screen and the emulator is keep eating ram and pagefile to no end.

3.On Crisis Core if Hardware Transform is enabled,almost everywhere when something is loading,there is a big delay(from 5 to 20 seconds)until the game continue.If HT is disabled,it load everything quickly but there are sound problems and the game runs little slower

The games I tried are:
Gods Eater Burst - Works fine but there is a black screen on the opening video(the sound is running)
Kingdom Hearts Birth by Sleep - if HT is on...huge ram usage
Ys Seven - slow if HT off...there missing text boxes too
Crisis Core - big delay if HT is on
Dissidia 012 - I'm not completely sure but I think this was the only game that don't have problem if HT is enabled...on every attack not executed at least once,there is slight slow down and sound stuttering but after that it's fine.
Dragon Ball Z Tenkaichi Tag Team - right before the beginning of battle(after that mini video(or whatever it's called)that shows the terrain around)),if HT on,this will lead to black screen and huge ram usage(if I disable the pagefile,the black screen disappear after a while and the game continue).If HT is off,there will be no black screen and the ram usage will be ok.

I'm using PPSSPP v0.8-32-gf1659a2 but I tried different versions too(the official and other older\newer betas)but it was the same.