Apache2Triad 1.5.1 was allways a very unstable version and all my experiences with it ended with the apache's dead, if you still like to keep apache2triad you should go with the the Apache2Triad 1.4.3 or 1.4.4, i am runing an apache2triad 1.4.3 on my home pc for several months and no problems, if you wanna move from to another package you can check THIS thread as they are a few others mentioned and they reflect several other XOOPS users experiences