I have noticed a problem with astroprint which is a real annoyance when using your great software on a raspberry pi.
If you have pre selected heatsin the target temp pull down box, use one to preheat the printer and cancel a print or complete a print, astro print will not respond if you re select the same pre selected setting to keep the temp up for the next print, instead you have to either manually type in a temp or select a different temp preset.
Can you please look into and fix this issue?