rebuilding copper mines - sector 3

[BlueFairy]

When I try to rebuild copper mines in sector 4 the message 'undefined text' shows up. New mine does not appear in building queue. Nor does the little '%' sign showing the mine being built. When re-logging it is there...
The I rebuild mine 2, and 3 - and same thing happens (sometimes, not all the time)

Not happened before - only since Thursday

[Nukar]

there is no copper in sector 3. any change your trying to build a copper mine on an iron deposit?

[BlueFairy]

there is no copper in sector 3. any change your trying to build a copper mine on an iron deposit?

My bad - it should've read sector 4 (the left one in the middle - one of the starting sectors), have edited post

Just happened again...