Hugin fails to create panorame picture

Binary package hint: hugin

I wanted to make a panorama picture with hugin under Ubuntu Ibex RC, but noticed several problems:

If I open some pictures, and want to use the assistent for aligning the images without creating manual control points it gives me the following error message:
Kommando:autopano-sift --maxmatches 20 /tmp/ap_resMFnuRp "/home/myusername/Bilder/pa251379.jpg" "/home/myusername/Bilder/pa251379.jpg" "/home/myusername/Bilder/pa251380.jpg"
ist fehlgeschlagen mit Fehlercode:255 [translates to: didn't work with error code 255]

This is the output of the in the console when starting hugin and performing the action described:
myusername@computer:~$ hugin
WARN: 18:05:42.091320 (/build/buildd/hugin-0.7.0~svn3191+beta5/src/hugin1/hugin/PanoPanel.cpp:308) StackCheck(): 0: HDR stacks detected
WARN: 18:05:42.119605 (/build/buildd/hugin-0.7.0~svn3191+beta5/src/hugin1/hugin/PanoPanel.cpp:308) StackCheck(): 0: HDR stacks detected
MainFrame::RestoreLayoutOnNextResize()
WARN: 18:05:44.329764 (/build/buildd/hugin-0.7.0~svn3191+beta5/src/hugin1/hugin/PanoPanel.cpp:308) StackCheck(): 0: HDR stacks detected
WARN: 18:05:44.396542 (/build/buildd/hugin-0.7.0~svn3191+beta5/src/hugin1/hugin/PanoPanel.cpp:308) StackCheck(): 0: HDR stacks detected
Error: Directory Makernote with 18761 entries considered invalid; not read.
Warning: Failed to read Makernote, rc = 6
Image: /home/myusername/Bilder/pa251379.jpg
CacheEntry: 2last access: 1 8bit: 1 16bit: 1 float: 1 mask: 1
Image: /home/myusername/Bilder/pa251379.jpg
CacheEntry: 3last access: 2 8bit: 1 16bit: 1 float: 1 mask: 1
WARN: 18:06:05.846447 (/build/buildd/hugin-0.7.0~svn3191+beta5/src/hugin1/hugin/PanoPanel.cpp:308) StackCheck(): 1: HDR stacks detected
Image: /home/myusername/Bilder/pa251379.jpg
CacheEntry: 3last access: 2 8bit: 1 16bit: 1 float: 1 mask: 1
Image: /home/myusername/Bilder/pa251379.jpg
CacheEntry: 3last access: 2 8bit: 1 16bit: 1 float: 1 mask: 1

If I first set manual control points, then the align button in the assistant works without any errors. But when I want to create the final panorama, I get the following error message:
nona -z PACKBITS -r ldr -m TIFF_m -o pan2 -i 0 /tmp/huginpto_f9D5lF
nona -z PACKBITS -r ldr -m TIFF_m -o pan2 -i 1 /tmp/huginpto_f9D5lF
nona -z PACKBITS -r ldr -m TIFF_m -o pan2 -i 2 /tmp/huginpto_f9D5lF
false -f5333x2042 -o pan2.tif pan20000.tif pan20001.tif pan20002.tif
make: *** [pan2.tif] Error 1

and it doesn't create the panorama picture. In hardy I never experienced that problem (and there are no spaces in the path to the pictures)