[gnucash-de] Is gnucash broken in the current Debian unstable distro?

[Wolfgang Balster]

When upgrading to up-to-date Debian unstable, Gnucash, which had been smothly 
running up to then, seems to be broken. This is what it says: 

sh-2.05b$ gnucash
Backtrace:
In unknown file:
    ...
   ?: 37  (begin (if # #) (make-modules-in # full-name))
   ?: 38* (if (or # #) (try-load-module name))
   ?: 39  [try-load-module (gnucash report iframe-url)]
   ?: 40  (or (begin (try-module-linked name)) (try-module-autoload name) ...)
   ?: 41* [try-module-autoload (gnucash report iframe-url)]
   ?: 42  (let* (# # # #) (resolve-module dir-hint-module-name #f) (and # #))
    ...
   ?: 43  (letrec ((load-file #)) (dynamic-wind (lambda () #) (lambda () 
#) ...) ...)
   ?: 44* [dynamic-wind #<procedure #f ()> #<procedure #f ()> #<procedure #f 
()>]
   ?: 45* [#<procedure #f ()>]
   ?: 46* (let ((file #)) (cond (# => #) (# => #)))
   ?: 47  [#<procedure #f #> 
"/usr/share/gnucash/guile-modules/gnucash/report/iframe$
   ?: 48  [load-file #<primitive-procedure primitive-load> ...]
   ?: 49* [save-module-excursion #<procedure #f ()>]
   ?: 50  (let (# #) (dynamic-wind # thunk #))
   ?: 51  [dynamic-wind #<procedure #f ()> #<procedure #f ()> #<procedure #f 
()>]
   ?: 52* [#<procedure #f ()>]
   ?: 53* [primitive-load 
"/usr/share/gnucash/guile-modules/gnucash/report/iframe-ur$
In /usr/share/gnucash/guile-modules/gnucash/report/iframe-url.scm:
   7: 54* [require format]
In unknown file:
   ?: 55  (cond ((not feature) (set! *catalog* #f)) ((slib:provided? 
feature)) ...)
    ...
   ?: 56  [scm-error misc-error #f ...]

<unnamed port>: In procedure scm-error in expression (scm-error (quote 
misc-error) #f ...):
<unnamed port>: slib:require unsupported feature format

I reinstalled gnucash to no avail. I have no clue as to what the backtrace 
says, so I need help.
-- 
Sincerely

Wolfgang Balster