Hey, I have a set of four Aputure Trigmaster Plus (not the Plus II version). I am using them together with two YN460-ii and one YN560-ii flashes. The fourth trigger sits atop my E-m5 and is used as transmitter for the flash signal. My problem is that the flashes are only sporadically/randomly firing. Sometimes a couple of times in a row, then multiple times nothing and once in a while they are firing again when I press the shutter. There isn't really a predictable pattern to it. The red led on the transmitter sitting in the hot-shoe always flashes red to indicate it is transmitting the "trigger signal". When the flashes are not firing, the red led on the receiving Trigmasters is not flashing (meaning "no signal received"). From this I would conclude that the Aputures are not probably working together or there might be an interference or something. Here comes the kicker, however: Whenever I press the two buttons on the fourth Trigmaster (the one set to transmit) to initiate a test triggering, the flashes always fire reliably. No matter which one of the Trigmaster's six channels is selected (of corse, the same channels on all four devices). My next test included using and shortening a PC sync cable on the transmitting Trigmaster. Same result - the flashes always fire. These are the settings on my four Aputure Trigmaster Plus: 3x RX - RX/TX (the ones attached to the flashes) 1x RX - RX/TX (the one on the hot-shoe) (underscored means selected) All devices set to the same channel (I tried all channels, with no difference) And on the Oly E-M5: Mode dial: M Manual flash (the lightning bold symbol with the word 'manual') Duration full (the lightning bold symbol with the word 'full') In order to rule out that there is something wrong with my E-M5's hot-shoe (albeit the red led on the transmitter always flashing when the shutter is pressed), I tried the same setup with my old G1 -> same result. Sometimes they fire and sometimes not. Infrequently only a subset of the three flashes fires (same behavior as with the E-M5). To sum it up: Using a PC sync cable (and shortening it) as well as using the test buttons on the transmitting Trigmaster, always fires the flashes. Letting the camera trigger the flash via the hot-shoe always brings up the red led on the transmitting Trigmaster but only randomly on the receiving ones (resulting in attached flashes not firing). I also swapped the devices around to no avail. Has someone a working setup with the E-M5 and the Aputure Trigmaster Plus? Is there something special I should set on the E-M5 (or G1) in order to have the manual flash / trigger working probably? Is there anything else I overlooked? Any tipps are really appreciated as I am completely clueless at the moment.