Architect Archive

has anyone else been having problems w/ trying to craft structural items... clicking back on the tool and then losing the resources and the spots in your inventory? i did not craft the item.. i was starting to add when i hit back... then i lost the first 10 spots... then i was trying to make a wall and 2 parts dissapeared so i removed each resource and i'm missing another 8 spots plus all the resources again....

grrrrr

any idea?