I get the error with rev 0148 on an intel pc (windows XP spanish) using the following
code:

void setup() {

}

void draw() {

println("Now");
delay(1000);
println("Now");
delay(1000);

}

Exception in thread "Animation Thread" java.lang.IllegalMonitorStateException:
current thread not owner
at java.lang.Object.wait(Native Method)
at processing.core.PApplet.delay(PApplet.java:1948)
at sketch_080824a.draw(sketch_080824a.java:8)
at processing.core.PApplet.handleDraw(PApplet.java:1400)
at processing.core.PApplet.run(PApplet.java:1305)
at java.lang.Thread.run(Thread.java:595)

the code works fine with rev 0135.

confirmed, will try to fix for 0149. thanks for the report.

Or if you're curious and want to get things working in the meantime... My
guess is that the problem is that the delay() is still occurring when
draw() gets called again (as it tries to keep running at 60 fps), so it's
possible that using noLoop() and redraw() might work better in your case.
However I'll hopefully have a fix in the next few days.

I downloaded version 148 in hope of making my code work, instead all codes
stopped working.

Each time I hit RUN, a new run window opened, but they wouldn't close, so I
had many bugged open windows for the same program.
To close those windows I had to close the code window.

I searched the bug list and discovered the delay bug 894,
removed all delays and the codes now work

but there's one window that still hasn't closed.
I can minimize and drag it, but not close it anyhow.
I have actually ran the respective code after that with no problems (it
created a new window, of course)

fixed for 0149.