When the new update goes live (you will know its live as there will be a blowpipe recharging option on the GUI) let me know if the issue continues
UPDATE:
Waiting on SDN approval and all that jazz, new update gives you the option of recharging your blowpipe (about time, ik) lots of bugs to do with rock cake been fixed and quest cape issue fixed. Coffer unlocking fixed. Erm. Many bugs slain (apologies, FrostBug). Added something to GUI to help you keep inventory spaces <= 28