Unresponsive part of screen in edit mode.

Posted by Marcello on 14 August 2020 in English (English).

This may be a strange one:

When editing, the upper left part of my screen is totally unresponsive. When i move my mouse to that part, objects do not ‘light up’ to be selected, nor can I connect points there. P2 has this issue, ID strangely not; the graphics on my laptop prohibit me from using JOSM. Is this my (not too new) laptop starting to desintegrate or something else ? Anyone has an idea ?

a wondering


Comment from Luciano on 14 August 2020 at 14:49

JOSM gets weird sometimes. Personally, I think it’s a Java memory-management problem, as opposed to being specific to JOSM. Your commment that P2 has it, but iD does not, is interesting. P2 uses Flash (which is also notorious for memory-management issues), and iD uses Javascript (which relies on the browser for memory management).

I have had issues similar to what you describe with JOSM, though nothing exactly like it. In the end, I have never had a problem with JOSM that wasn’t solved by “shut down and restart.”

If restarting JOSM (and/or your computer) doesn’t solve the problem, I would definitely think that the problem was with the graphics card or video driver software on your computer.

Comment from Marcello on 15 August 2020 at 19:58

It’s even worse:

I have the very same issue on my desktop: different processor, different OS, different graphics card, different screen…. Only the area seems smaller, but that may be because my screen is larger.

And to add insult to injury: when I edit in Open StreetMap - also in P2 - I do NOT have the issue. Same Flash, same browser…. I’m getting crazy.

This does not prohibit me from editing, but i DO want to know what’s going on.


Comment from Luciano on 15 August 2020 at 20:39

That makes me wonder if it’s perhaps a latency problem - the OGF site is certainly slower in its response-times compared to OSM.

Have you messed with these settings in JOSM?

Comment from Marcello on 17 August 2020 at 08:13


Mine (Desktop only, as JOSM is not an my laptop) are different indeed, at 150 / 300. Whether that is bigger, better, grossly overdone, downright stupid or whatever I do not knot because I haven’t the faintest clue what the parameter is about. If ‘my’ values are different from default, I have changed them after consultation of OGF users or the Wiki. Mind you, the desdtop runs Windows7, the laptop Windows10. Both have WiFi.


What would an JOSM parameter have for effect on a laptop where JOSM is not installed ? That’s where my issue originated.


Comment from Luciano on 17 August 2020 at 13:08

OK, I misunderstood your description in a comment with respect to the context of the original problem. Sorry. I didn’t realize your focus was on Potlatch. You’d said you had it also with JOSM. and of course changing a JOSM parameter will only affect JOSM. I guess it’s a laptop problem.

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