Scaling of block does not scale the texts inside

I have a set of blocks created in the wrong scale. When i rescale the block the texts remain the same in size. If i explode the block and rescale individual text the same thing happens. in fact if i go into the text height property i can see that the value have changed, but still the text remains drawn to the old scale.

Googling this i find that it might have something to do with text styles, so i have set the height in the current text style to 0 as suggested. Its not working..

Any new text inserted in the drawing can be rescaled.

Tried both in professional and free.

Anybody knows?