Dear Jasem, I have taken the time to detail the June 10, 2021 session minute by minute. My goal was to document the problem in connection with the FITS and Calibrate window. But nothing went as planned. Before leaving, I had updated my StellarMate. The system updated 28 components. From then on, preparing flats with Calibrate was not a problem. Switching the display in the FIT window from "Histogram" to "Statistics" which was crashing Kstar works perfectly (Grrr! I hate these bugs which are not reproducible). After the update, I even noticed that Calibrate saved the settings, which was not the case before. For this problem, the case is solved. Thank you. However, what has always been a problem has become a major obstacle. After the update, my QHYCCD cameras were no longer recognized by EKOS. I had to make some changes in the physical wiring. So I moved the cameras from the USB3 HUB to USB2 HUB. But I was not able to test the QHYCCD5III178C while guiding. It is when I arrived on site that I discovered the problem. Everything went perfectly until 23:05 (page 17 of the PDF). There I connected the QHY5III178C guidance camera.As a reminder, the internal guidance of SM never went below +/- 8". So, I switched to PHD2. If the two cameras QHY294M and QHY5III178C are connected when EKOS starts, EKOS identifies and initializes them. But when I start PHD2, it connects the EQMod mount and the guidance camera. But at the first loop, PHD2 doesn't answer anymore. Pressing stop has no effect. It is necessary to kill PHD2 to take again the hand. Obviously, the guidance doesn't work. On the other hand, if I start EKOS without connecting the QHY5III178C guidance camera, EKOS only sees the QHY294M. Once EKOS has started, I connect the QHY5III178C and launch PHD2. PHD2 initializes the camera and the guidance starts normally. If I ask for a stop on PHD2, the camera stops the looping function and I take over.Except that on 10.06.2021 at 23:05, PHD2 did not see my camera. I made many unsuccessful attempts until 00:53 when I tried to move the QHY5III178C from the USB2 Hub to the USB3 Hub. After that, PHD2 obviously found the guiding camera and I was able to image without a problem.The fact remains that EKOS obviously confuses QHY294M and QHY5III178C when both cameras are present at startup. I tried to document my entire sequence. Obviously, I have log files which are relatively large. But here is in the attached file a systematic flow of the session of June 10, 2021. I know that this problem exists since I created my setup with QHY294M, PoleMaster and QHY5III178C. But it's complicated to show. So, I hope this will help to understand what is going on. Thank you for your helpSincerelyChristian

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