Clicking "Hide areas" on the data panel breaks the slippy map ending up at NaN zoom

[Deanna Earley]

Looking at some data around Botley (​http://www.openstreetmap.org/#map=18/50.91446/-1.27131&layers=N) I zoomed in, enabled the data panel, clicked "Hide areas", after which, the vector data wouldn't be shown, any attempt to zoom failed, and on a refresh, the map view stayed blank. The cookie had a coordinate of NaN stored. To recover, I had to use the "current location" button.

This was reproducible 3 times in a row on IE9 on Windows 7, but does not occur on IE10 on Windows 8.

I'll confirm again and get exact step when I'm next on that machine.

[pnorman]

Confirmed on IE 9.0.8112.16421 with update versions 9.0.18 on a just updated Windows 7. No attempt to diagnose, just confirming.

[Deanna Earley]

Seems to work OK on IE10 on Win7 too.

[Deanna Earley]

Just tested again with a much simplified: 1) visit this URL: ​http://www.openstreetmap.org/#map=19/50.91423/-1.33659&layers=D 2) Press "Hide areas"

After this, it shows the updated list of objects, but no outlines. Attempting to pan changes the scale to sub 1metre/1foot, and the anchor text disappears. Zooming then "loses" the tiles. Panning again then changes the scale to 3000000km/2000000miles. Refreshing at this point leaves it at the same scale with still no tiles.

Looking at the cookies, _osm_location has a value of "-180%7C-90%7CNaN%7CMD"

The page is being rendered in IE9 standards mode.

This is all reproducable on demand using IE 9.0.8.8112.16421, with update KB2846071 (9.0.18) On Windows 7 Service Pack 1.

[Tom Hughes]

Fixed by John in c919340/rails.