It used to be the case that in Potlatch I could move satellite image backgrounds around (to fix any alignment problems with the map data) by holding the space bar while dragging the mouse/touchpad.
This doesn’t work any more. I don’t know whether Potlatch has changed or if it’s a problem with my PC.
Dell laptop running Windows 10 (same problem existed in Windows 8), browser used is latest version of Chrome (MS Edge also has the problem).
Don’t hesitate to ask here when you get stuck somewhere … but after two weeks or watching some tutorial videos (yes, they do exist) you will have success in using JOSM! I am sure!!
For info, with a flash player that Mozilla’s plugincheck says is up to date, works for me on Windows 7 in SeaMonkey and Chrome
Re JOSM, I’d love it if some of the “you ought to use JOSM” people could answer some of the outstanding JOSM questions that I’ve asked in the past (see some of https://help.openstreetmap.org/users/387/someoneelse?questions_sort=active&questions_page=2 ). It’s a shame, because what it can do it does well - it just fails at some of the basics that I’d need as a (clearly not very typical) survey-based mapper
The ones on the page that I linked to - both the ones without an accepted answer, and where I accepted an answer that says “you can’t do that with JOSM”.
A couple of new answers have popped up there - so thanks to the submitters for those.
While using Google Chrome 46.0.2490.71 m I can see while in Potlatch by right clicking my mouse that it’s Flash 19.0.0.226
Can also swap browsers to Microsoft Edge and that tells me that it’s working with Flash 19.0.0.185 (and I have the same problem here).
From memory, this feature of Potlatch worked fine when I was using Windows 7 but stopped working when I upgraded to Windows 8 (and has now continued not working under Windows 10).