Thanks so much for the quick reply, Kovid.
I don't think it's in Topaz, b/c I was able to remove DRM using Kindle4PC, and I can't do that w/Topaz formats. Here are the details of the error message:
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Convert book 1 of 1 (Harlequin comics: Lord Calthorpe's Promise I)
Resolved conversion options
{'asciiize': False,
'author_sort': None,
'authors': None,
'base_font_size': 0.0,
'book_producer': None,
'change_justification': u'original',
'chapter': u"//*[((name()='h1' or name()='h2') and re:test(., 'chapter|book|section|part\\s+', 'i')) or @class = 'chapter']",
'chapter_mark': u'pagebreak',
'comments': None,
'cover': 'c:\\users\\saparikh\\appdata\\local\\temp\\calibr e_0.6.53_yylppf.jpeg',
'custom_size': None,
'debug_pipeline': None,
'disable_font_rescaling': False,
'extra_css': None,
'font_size_mapping': None,
'footer_regex': u'(?i)(?<=<hr>)((\\s*<a name=\\d+></a>((<img.+?>)*<br>\\s*)?\\d+<br>\\s*.*?\\s*)|(\\s* <a name=\\d+></a>((<img.+?>)*<br>\\s*)?.*?<br>\\s*\\d+))(?=<br>)' ,
'header_regex': u'(?i)(?<=<hr>)((\\s*<a name=\\d+></a>((<img.+?>)*<br>\\s*)?\\d+<br>\\s*.*?\\s*)|(\\s* <a name=\\d+></a>((<img.+?>)*<br>\\s*)?.*?<br>\\s*\\d+))(?=<br>)' ,
'input_encoding': None,
'input_profile': <calibre.customize.profiles.InputProfile object at 0x045CEA30>,
'insert_blank_line': False,
'insert_metadata': False,
'isbn': None,
'language': None,
'level1_toc': None,
'level2_toc': None,
'level3_toc': None,
'line_height': 0.0,
'linearize_tables': False,
'margin_bottom': 5.0,
'margin_left': 5.0,
'margin_right': 5.0,
'margin_top': 5.0,
'max_toc_links': 50,
'no_chapters_in_toc': False,
'no_inline_navbars': False,
'orientation': u'portrait',
'output_profile': <calibre.customize.profiles.SonyReaderOutput object at 0x045CEDD0>,
'page_breaks_before': u"//*[name()='h1' or name()='h2']",
'paper_size': u'letter',
'prefer_metadata_cover': False,
'preprocess_html': False,
'pretty_print': False,
'pubdate': None,
'publisher': None,
'rating': None,
'read_metadata_from_opf': 'c:\\users\\saparikh\\appdata\\local\\temp\\calibr e_0.6.53_onpqfj.opf',
'remove_first_image': False,
'remove_footer': False,
'remove_header': False,
'remove_paragraph_spacing': False,
'remove_paragraph_spacing_indent_size': 1.5,
'series': None,
'series_index': None,
'tags': None,
'timestamp': None,
'title': None,
'title_sort': None,
'toc_filter': None,
'toc_threshold': 6,
'unit': 'inch',
'use_auto_toc': False,
'verbose': 2}
InputFormatPlugin: MOBI Input running
on C:\Users\saparikh\Documents\Calibre books\OGATA_RIN\Harlequin comics_ Lord Calthorpe's Promi (817)\Harlequin comics_ Lord Calthorpe's Promi - OGATA_RIN.mobi
Extracting text...
Adding anchors...
Extracting images...
Cleaning up HTML...
Parsing HTML...
Converting style information to CSS...
Creating OPF...
Parsing all content...
Parsing styles.css ...
Parsing Harlequin_co-rpes_Promise_I.html ...
Forcing Harlequin_co-rpes_Promise_I.html into XHTML namespace
Generating default TOC from spine...
Merging user specified metadata...
Detecting structure...
Auto generated TOC with 0 entries.
Flattening CSS and remapping font sizes...
Python function terminated unexpectedly
max() arg is an empty sequence (Error Code: 1)
Traceback (most recent call last):
File "site.py", line 103, in main
File "site.py", line 85, in run_entry_point
File "site-packages\calibre\utils\ipc\worker.py", line 99, in main
File "site-packages\calibre\gui2\convert\gui_conversion.py", line 24, in gui_convert
File "site-packages\calibre\ebooks\conversion\plumber.py", line 877, in run
File "site-packages\calibre\ebooks\oeb\transforms\flatcss.py" , line 123, in __call__
File "site-packages\calibre\ebooks\oeb\transforms\flatcss.py" , line 167, in baseline_spine
ValueError: max() arg is an empty sequence
----------------------------------