Printer prints garbage and "/usr/lib/cups/filter/pstopdf failed" at CUPS web interface Ubuntu 12.04

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http://askubuntu.com – Hi I'm using a thermal printer tm-t20 at Ubuntu 12.04 x64. With cups 1.5.3-0ubuntu4 and the epson provided drivers tmt-cups-1.3.2. The printer just prints garbage after the first print. If I turn it off and then on, it prints ok (the first Job), but if I send another job it prints just garbage. The printer is serial and I'm using an usb to serial converter, I tried with different adapter to discard an usb to serial converter issue. At the cups web interface the following error is shown at job list: stopped "/usr/lib/cups/filter/pstopdf failed" part of the log: [Job 15] Error: /dictstack (HowTos)