Odd marks on negative -- help needed

[Steve Homer <shomer@xxxxxxxxxx>]

In need the list's advice about some odd marks on my
negatives. Occasionally with past rolls of Kodak IR
Aerographic (70mm), and on almost every frame of the
latest roll I bought, I am getting stains or marks on
the negative. These appear as lighter wavy lines
wandering across the print or contact sheet, about 1mm
wide. You can see a sample contact sheet at this URL: 

	http://members.cruzio.com/~shomer/stain.jpg

I had processed this film for three years with no
trouble. I use TMAX-RS developer as a 1-shot developer
(no reuse or replenishment); Kodak indicator stop;
Lauder non-hardening fixer; and Heico hypo-clear; with
a final rinse in Kodak photo-flo. Mixing all the
chemicals fresh makes no difference in the
stains/marks, and TMAX 100 or Maco IR processed in the
same stop, fix, and hypo clear do  not show these marks.

The only changes in my processing recently are:
switching from Ilford fixer to Lauder, and from Orbit
Bath to the Heico hypo-clear. I didn't notice that the
problem started when I switched to either of these
chemicals, but that is possible.  

Does this seem like a manufacturing problem in the film
or a processing problem? Is it plausible that the
change of fixer or hypo-clear is to blame? If it's a
processing problem, can anyone offer a suggestion for
avoiding it? Any advice would be appreciated. 
____________________________________________________
Steve Homer    shomer@xxxxxxxxxx   Santa Cruz, CA  USA
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