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Might it be that it keeps called by the paint event when it haven't already terminated the previous execution?

Only a stub in the dark.

EMG

... unos cuantos errores más. E2451 hello.c 16: Undefined Symbol 'NULL' E2141 " Declaracion Syntax Error E2190 " Unexpected } E2040 " Declaration terminated incorrectly ETC.... 2109 " 18 Not an allowed type in function hb_vm _SimbolInit_HELLO 13 Errores in compile y así hasta lógicamente el error ...