確認いたしました。
　ずれは生じていないですね。
　だとすると，私の環境でなにかまずいところがあるということのようですね。

　ログファイルのコピーです。（元ファイル名は test.tex）
　もしも何かお気づきの点がありましたら，ご教示いただければと思います。

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This is pTeX, Version 3.141592-p3.1.9 (sjis) (Web2C 7.5.5) (format=platex 2006.1.6)  12 NOV 2007 20:28
**test.tex
(./test.tex
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Babel <v3.8h> and hyphenation patterns for english, usenglishmax, ukenglish, ba
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mongolian, dutch, norsk, polish, portuguese, pinyin, romanian, russian, samin, 
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No file test.aux.
\openout1 = `test.aux'.

LaTeX Font Info:    Checking defaults for OML/cmm/m/it on input line 8.
LaTeX Font Info:    ... okay on input line 8.
LaTeX Font Info:    Checking defaults for T1/cmr/m/n on input line 8.
LaTeX Font Info:    ... okay on input line 8.
LaTeX Font Info:    Checking defaults for OT1/cmr/m/n on input line 8.
LaTeX Font Info:    ... okay on input line 8.
LaTeX Font Info:    Checking defaults for OMS/cmsy/m/n on input line 8.
LaTeX Font Info:    ... okay on input line 8.
LaTeX Font Info:    Checking defaults for OMX/cmex/m/n on input line 8.
LaTeX Font Info:    ... okay on input line 8.
LaTeX Font Info:    Checking defaults for U/cmr/m/n on input line 8.
LaTeX Font Info:    ... okay on input line 8.
LaTeX Font Info:    Checking defaults for JY1/mc/m/n on input line 8.
LaTeX Font Info:    ... okay on input line 8.
LaTeX Font Info:    Checking defaults for JT1/mc/m/n on input line 8.
LaTeX Font Info:    ... okay on input line 8.
LaTeX Font Info:    Font shape `JT1/mc/bx/n' in size <12> not available
(Font)              Font shape `JT1/gt/m/n' tried instead on input line 12.
LaTeX Font Info:    Font shape `JY1/mc/bx/n' in size <12> not available
(Font)              Font shape `JY1/gt/m/n' tried instead on input line 12.
LaTeX Font Info:    Try loading font information for U+msa on input line 12.
(c:/usr/local/share/texmf/tex/latex/amsfonts/umsa.fd
File: umsa.fd 2002/01/19 v2.2g AMS font definitions
)
LaTeX Font Info:    Try loading font information for U+msb on input line 12.

(c:/usr/local/share/texmf/tex/latex/amsfonts/umsb.fd
File: umsb.fd 2002/01/19 v2.2g AMS font definitions
)
LaTeX Font Info:    Try loading font information for U+esvect on input line 12.


(c:/usr/local/share/texmf/ptex/platex/base/uesvect.fd
File: uesvect.fd 
) [1

] (./test.aux) ) 
Here is how much of TeX's memory you used:
 7369 strings out of 94500
 75768 string characters out of 1175100
 230129 words of memory out of 1500000
 10603 multiletter control sequences out of 10000+50000
 15147 words of font info for 64 fonts, out of 600000 for 2000
 679 hyphenation exceptions out of 8191
 61i,14n,36p,307b,402s stack positions out of 3000i,500n,5000p,200000b,5000s

Output written on test.dvi (1 page, 2404 bytes).


----------------------------------------------------------------------

▼関連発言
│
└◆6651:--- [---] 11/07 01:54
　├◆6652:--- [---] 11/07 11:45
　└◆6686:Re:ベクトルの矢印の形状 [留数] 11/12 08:07
　　└◆6687:Re[2]:ベクトルの矢印の形状 [tDB] 11/12 10:46
　　　└◆6689:Re[3]:ベクトルの矢印の形状 [留数] 11/12 20:33
　　　　└◆6691:Re[4]:ベクトルの矢印の形状 [tDB] 11/12 21:01
　　　　　└◆6692:Re[5]:ベクトルの矢印の形状 [留数] 11/12 21:05
　　　　　　└◆6693:Re[6]:ベクトルの矢印の形状 [tDB] 11/12 21:15
　　　　　　　└◆6694:Re[7]:ベクトルの矢印の形状 [留数] 11/12 21:18<-last