This definitely happens in SP after chunk unloading/reloading. Every, single, time. I don't have to break comparators though, any action involving redstone update next to it fixes her up. One of my (hopefully temporary) workarounds is to trigger a signal (from either detector rail or mob falling thru tripwire) next to comparator. It does not have to actually modify comparator's state directly. In one instance I have a redstone torch placed directly above the repeater amplifying comparator signal (hopper load); said torch is operated by falling mob tripwire. The torch is shining onto repeater from top 1 block above - so it has no effect on the actual circuit but seems it works well as my train no longer waits till infinity and I've tested it at least a dozen times now. I do similar thing at unloading station, where arriving cart triggers a signal (just a wire will do) running in the vicinity of the comparator.
One thing I noticed that the comparator attached directly to hopper/chest etc works fine. Trouble for me seems to be with comparators attached via block.
Adam J. Sycz
This definitely happens in SP after chunk unloading/reloading. Every, single, time. I don't have to break comparators though, any action involving redstone update next to it fixes her up. One of my (hopefully temporary) workarounds is to trigger a signal (from either detector rail or mob falling thru tripwire) next to comparator. It does not have to actually modify comparator's state directly. In one instance I have a redstone torch placed directly above the repeater amplifying comparator signal (hopper load); said torch is operated by falling mob tripwire. The torch is shining onto repeater from top 1 block above - so it has no effect on the actual circuit but seems it works well as my train no longer waits till infinity and I've tested it at least a dozen times now. I do similar thing at unloading station, where arriving cart triggers a signal (just a wire will do) running in the vicinity of the comparator.
One thing I noticed that the comparator attached directly to hopper/chest etc works fine. Trouble for me seems to be with comparators attached via block.