unexpected character

After updating my MikTex yesterday (I think that's when the troubles star=
ted), ppower4 does not like my pdf-s anymore:

--- start log ---
H:\teaching\EK\w04\lect1>java -cp C:\Programme\Java\j2re1.4.2_01\lib\pp4p=
b.jar de.tu_darmstadt.sp.pp4.PPower4 lect1_slide.pdf lect1_slidep4.pdf
This is PPower4 version 0.8.x-SP-beta5.
Exception in thread "main" de.tu_darmstadt.sp.paul.TokenMgrError: Unexpec=
ted character '(' found in text string.
        at de.tu_darmstadt.sp.paul.PDFParserTokenManager.MoreLexicalActio=
ns(PDFParserTokenManager.java:1305)
        at de.tu_darmstadt.sp.paul.PDFParserTokenManager.getNextToken(PDF=
ParserTokenManager.java:1177)
        at de.tu_darmstadt.sp.paul.PDFParser.jj_scan_token(PDFParser.java=
:437)
        at de.tu_darmstadt.sp.paul.PDFParser.jj_3_1(PDFParser.java:349)
        at de.tu_darmstadt.sp.paul.PDFParser.jj_2_1(PDFParser.java:343)
        at de.tu_darmstadt.sp.paul.PDFParser.ObjectOrReference(PDFParser.=
java:254)
        at de.tu_darmstadt.sp.paul.PDFParser.Dictionary(PDFParser.java:24=
3)
        at de.tu_darmstadt.sp.paul.PDFParser.Object(PDFParser.java:185)
        at de.tu_darmstadt.sp.paul.PDFParser.IndirectObject(PDFParser.jav=
a:123)
        at de.tu_darmstadt.sp.paul.PDFParser.parseObj(PDFParser.java:99)
        at de.tu_darmstadt.sp.paul.PDFParser.getObj(PDFParser.java:80)
        at de.tu_darmstadt.sp.paul.PDFDictionary.resolveReferences(PDFDic=
tionary.java:299)
        at de.tu_darmstadt.sp.paul.PDFParser.resolveObject(PDFParser.java=
:113)
        at de.tu_darmstadt.sp.paul.PDFParser.parseTrailer(PDFParser.java:=
65)
        at de.tu_darmstadt.sp.paul.PDFParser.<init>(PDFParser.java:34)
        at de.tu_darmstadt.sp.paul.PDFFile.read(PDFFile.java:91)
        at de.tu_darmstadt.sp.pudl.Document.<init>(Document.java:48)
        at de.tu_darmstadt.sp.pudl.Document.<init>(Document.java:60)
        at de.tu_darmstadt.sp.pp4.PP4Pages.work(PP4Pages.java:425)
        at de.tu_darmstadt.sp.pp4.PPower4.main(PPower4.java:175)
--- end log ---

I admit, I do not understand a single word of it. (I'm glad I got this th=
ing running a few years ago--better not to ask how.) Any computer wizards=
 out there who know what this means (and how to overcome it)?

Thanks,
r'



----------------------
Ren=E9 B=F6heim ([email protected])
www.econ.jku.at/boeheim
Johannes Kepler Universit=E4t Linz
Economics
Altenbergerstr. 69
A-4040 Linz, Austria

Tel.: +43-732-2468-8214
Fax: +43-732-2468-2-8214