Just so that you know. SMP is still broken and I’m aware of it. Working on improving things here. If you are interested into a little bit of background, there is a bit of a technical breakthrough between the old and the new pipes implementation. In the old scheme, a pipe was using a block id. This was already a lot when just transporting items, but it became just unreasonable to keep up with that scheme with additional waterproof and conductive pipe.
Modders may be aware of the “metadata” method to extends block ids. That’s what is done for example for wool, where each colors corresponds to a different metadata. The issue is that there is only 16 values available for metadata, and that there are already used in some pipes (e.g., to determine the input of wooden pipes, or output of iron pipes).
So the new scheme relies on pipes ids that are actually item ids, maintained by the tiles. I won’t dive into more details, but in short, while this is very reliable in SSP, this bring up all kind of synchronization issues with SMP. Hence the many crashes that everybody is having.
So I’m still working on it, hoping to release a 2.2.3 soon that will fix there. Be patient though, remember that the 2.x branch is still a beta program – beta program that I’m hoping to get out soon!