Before patch that introduced ',' separator in crowns amount when you wanted to type an price and then select amount of CEx100 you wanted to buy system checked your crowns and wont allow you to 'post' button.
Example:
You have 12000 CR. You post 1x buy offer for 6500CR - the 'post' button is active. You change amount to 2x buy offer for 6500R and 'post' button is inactive.
Now system dont check your crowns and keeps 'post' button active all the time.
Example:
You have 12000 CR. You post 1x buy offer for 6500CR - the 'post' button is active. You change amount to 2x buy offer for 6500R and 'post' button is still active. After clicking it it just shows "insuffiscent crowns" error.
Now you need to check by yourself how many 100CE packs you can post to buy before you could just put price and by changing amount checking when you wont have enough crowns which was much faster.
ps. i think this bug is related to that ',' thing.
Man, alt-tabbing just to use the calculator isn't cool