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Can't recover from a bad entry into the projection object properties I opened the tutorial map. I created a new projection object and I added the following parameter: "init=epsg:42304". I applied the changes. Since the new object did not appear into the object browser view, I made a reload. The following message was displayed into the map view: "The map could not be displayed because it is in an invalid state.". To be able to edit the map again I had to open the map again. The main point here it is: If I made several changes without saving yet I lost everything.
The map can be saved when the preview is not shown, so it should not be necessary to abandon changes. From the current CVS version, there are some issues with the javascript tree not being refreshed, but these will be addressed and the current workaround is to manually reload the treeview frame. The preview can be 'restarted' by clicking the icon with the eyeglasses in the main toolbar. In my tests, that recovered from the described problem.