Exact same thing here.  Uninstalled Sins and re-installed and same thing still happens.  Some change between last beta and release makes cycling folders in the map screen cause Sins to do something bad it seems...

found out that its the galaxy forge map editor, needs to be updated.  take the maps out of the galaxyforge folder and throw them into another folder where your game cannot find them.  just have to wait till a patch fixes the problem.

My maps work just fine with version 1.02. Its probably some maps of yours are no longer compatible. You'll need to update them for them to work again.

I also have this issue since 1.02 was downloaded, and am currently working on updating my map updater, but am having an issue  with the exact map structure, so have no idea when my map updater will be into beta.

harpo

back in sins vanilla 1.05 it was a number change AND one line added in the start area, in vanilla sins 1.10 it was a number change AND another line added in the start area, and with vanilla sins 1.15/entrenchment it was a LOT more than a number change and a added line, it was five changed lines and five added lines per planet, start,template and player areas.

as for converting the maps it has been suggested that the galaxyforge in the steamapps/common folder might be able to do so, but I have not tested this.

harpo