Reports generate error when 'step size' is by week

[Chadwick A. McHenry]

Just upgraded gnucash to 1.8.1 after having used it for about a year now.
Kudos to all developers for 1) a great product in general, and 2) a
surprisingly easy upgrade!  I was terribly reluctant to do it, but the
migration to 1.8 wasn't bad at all (I did have to upgrade g-wrap, but rpm
gave me the dependancy error, and I actually figured I'd have to upgrade
more!)

That said, did I miss something in the process (versions below)? When
trying to change the reports (using gui interface) to display a "Step
Size" of 'week' or '2 weeks', the display just says 'Report Error...'.
when I run in a shell, this is dumped:

23  (let ((template #) (doc #f)) (set! doc (if template # #f)) doc)
24* (set! doc (if template (let* # # # ...) #f))
25* (if template (let* # # # ...) #f)
26  (let* (# # # ...) (gnc:html-document-set-style-sheet! doc stylesheet)
...)
27* [#<procedure #> #]
28  [category-barchart-renderer # Assets Over Time # ...]
    ...
29  (letrec ((show-acct? #)) (if (not #) (let* # #) ...) ...)
30* (if (not (null? accounts)) (let* (# # # ...) (letrec # # ...)) ...)
31  (let* (# # # # ...) (letrec # # # ...))
32* (if do-intervals? (gnc:make-date-interval-list # # ...) ...)
33  [gnc:make-date-list (1009947599 . 0) (1046062799 . 0) #f]
    ...
34  [cons (1009947599 . 0) ...
35*  [gnc:make-date-list ...
36*   [incdate (1009947599 . 0) #f]
37    [moddate #<primitive-procedure +> (1009947599 . 0) #f]
38    (let ((newtm #)) (set-tm:sec newtm (op # #)) ...)
39*   [set-tm:sec #(59 59 23 1 0 102 2 0 0 ...) ...
40*    [+ 59 ...
41*     [tm:sec #f]
42      [vector-ref #f 0]
ERROR: In procedure vector-ref in expression (vector-ref obj 0):
ERROR: Wrong type argument in position 1: #f

---

After trying several times, it eventually crashed on me (was it
significant that I went from the '2 weeks' to 'week' when it crashed?)

Versions:
linux Dist: RedHat 8.0 using Ximian RedCarpet for updates
(using rpm -q ...)
gnucash-1.8.1-1.RH8.0
g-wrap-1.3.4-1
gtk+-1.2.10-22
glade-0.6.4-7
guile-1.4-8
gtkhtml-1.0.4-3
libghttp-1.0.9-5
Guppi-0.40.3-9
gnome-print-0.35-8

slib: (installed but don't know version. trying to install 'latest'
	rpm from <http://www-swiss.ai.mit.edu/~jaffer/SLIB.html>
	actually broke gnucash until I removed it.)

the others I couldn't get from rpm and figure aren't the issue, let me
know how I might help.

...Chad