Stuck on Image Download


My own system is much simpler than the one that you describe - yet I have had this hangup problem. It is random so connecting devices one at a time cannot solve the problem - besides, they are all needed to make the system work.



That won’t solve the problem, but for sure can help to debug it (by the way, I was a software developer too).

That’s undoubtedly true. But you need just the camera and the PC to create a dark or bias library. Did you experience the same problems in doing so? If not, then the problem is to be found in another device or in an anomalous interaction between two (or more) devices.

Until you isolate the pieces, finding the problem will prove to be exceedingly difficult.


Ah! Discovered that I had the wrong setting. Now all is fine. Many



Just a couple of observations – as a long time software developer, I have learned that random, strange behavior is far more likely to be a hardware issue than a software one – especially when thousands of people are using the software and only a handful are reporting the problem.

Our imaging gear is often used in environments for which it was not designed – that is, it not 50% humidity and its not 78 degrees. I would recommend that an imaging environment needs to use “industrial” grade USB hubs (powered), switches, routers, etc. and use USB cables from a major provider of USB cables. $5 USB cables and $20 USB hubs don’t cut it.

Use Windows 10 Pro – I was a die hard Windows 7 user for years but converted a year and a half ago. I have been very happy with the stability of Windows 10 Pro. It seems to have much more stable device drivers than previous versions. I would not consider using anything else for my imaging software. Since it is now legal to download and install Windows 10 Pro for free, so that cost is no longer an issue.

Speaking of Windows 10 Pro – there is a USB option (Control Panel / Power Options) that needs to be disabled just to be safe:


Also make sure nothing on your imaging PC is configured to allow it to go to sleep at any time.

My imaging camera, my guide camera, my focuser, my rotator, and my roof controller all connect to one industrial grade, powered USB 3.0 hub. Most of my gear is USB 2.0. That hub is connect to my observatory PC via a USB 2.0, 25 foot powered extension cable. I have never had a download freeze on either my imaging camera or guide camera. I do not suspend guiding during download but I do suspend guiding during auto focus.



Chas offers some good advice. The advanced power settings also apply to Windows 7. Strangely I have gone back to Win 7 from 10 Pro. Windows updates keep messing with my system.

Some time ago I followed up on a recommendation to use the StarTech Industrial USB2 (and now 3) hubs with good quality cables. These have a robust construction, wider operating specification and usefully internally regulate a DC supply (I use 12V). These have been completely reliable, permanently stuck out in a shed. A couple of my UK colleagues had issues with various USB hubs. These were normal office spec ones, the sort you find on Amazon or eBay in plenty. They tried my StarTech one and their problems went away.
I think these units use the preferred NEC chipset but are not unique to StarTech as I have seen similar units with different brand names.


So far from being “free”, Windows-10 Pro costs £220 (minus 1p).


Lawrence Harris