Quoth the wikipedia:
[Flash: Rebirth] has also been subject to criticism due to several extreme delays. While issues 1, health 2 and 3 all came out on time as scheduled, cialis issue #4 was subject to nearly a month of delays and was eventually released nearly 2 and a half months after issue #3. The fifth issue experience similar delays, medicine finally being released in late November. The final sixth issue was then re-scheduled for release in late December, then was pushed back to late January before again being delayed to March 24th. Issue 6 is now been moved up in release, with the new currently scheduled release date of February 24th, 2010.