This error showed up and crippled our forum, which is :
SMF File Your Version Current Version
SMF Package SMF 1.1.14 SMF 1.1.14
Sources 1.1.14 1.1.14
Admin.php 1.1.6 1.1.6
Akismet.class.php ?? ??
Akismet.php ?? ??
BoardIndex.php 1.1.11 1.1.11
Calendar.php 1.1.5 1.1.5
Display.php 1.1.11 1.1.11
DumpDatabase.php 1.1.12 1.1.12
Errors.php 1.1 1.1
Help.php 1.1 1.1
Karma.php 1.1.5 1.1.5
Load.php 1.1.11 1.1.11
LockTopic.php 1.1 1.1
LogInOut.php 1.1.6 1.1.6
ManageAttachments.php 1.1.11 1.1.11
ManageBans.php 1.1.10 1.1.10
ManageBoards.php 1.1.2 1.1.2
ManageCalendar.php 1.1.11 1.1.11
ManageErrors.php 1.1 1.1
ManageMembergroups.php 1.1.4 1.1.4
ManageMembers.php 1.1.11 1.1.11
ManageNews.php 1.1.13 1.1.13
ManagePermissions.php 1.1.11 1.1.11
ManagePosts.php 1.1 1.1
ManageRegistration.php 1.1.10 1.1.10
ManageSearch.php 1.1.12 1.1.12
ManageServer.php 1.1.5 1.1.5
ManageSmileys.php 1.1.12 1.1.12
Memberlist.php 1.1 1.1
MessageIndex.php 1.1 1.1
ModSettings.php 1.1 1.1
Modlog.php 1.1.11 1.1.11
MoveTopic.php 1.1 1.1
News.php 1.1.12 1.1.12
Notify.php 1.1 1.1
PackageGet.php 1.1.12 1.1.12
Packages.php 1.1.11 1.1.11
PersonalMessage.php 1.1.10 1.1.10
Poll.php 1.1.11 1.1.11
Post.php 1.1.11 1.1.11
Printpage.php 1.1 1.1
Profile.php 1.1.11 1.1.11
QueryString.php 1.1.13 1.1.13
Recent.php 1.1.5 1.1.5
Register.php 1.1.10 1.1.10
Reminder.php 1.1.6 1.1.6
RemoveTopic.php 1.1.5 1.1.5
RepairBoards.php 1.1 1.1
Reports.php 1.1 1.1
SSI.php 1.1.13 1.1.13
Search.php 1.1.13 1.1.13
Security.php 1.1.9 1.1.9
SendTopic.php 1.1 1.1
SplitTopics.php 1.1.11 1.1.11
Stats.php 1.1.6 1.1.6
Subs-Auth.php 1.1.11 1.1.11
Subs-Boards.php 1.1.11 1.1.11
Subs-Charset.php 1.1 1.1
Subs-Compat.php 1.1.6 1.1.6
Subs-Graphics.php 1.1.11 1.1.11
Subs-Members.php 1.1.14 1.1.14
Subs-Package.php 1.1.12 1.1.12
Subs-Post.php 1.1.9 1.1.9
Subs-Sound.php 1.1.6 1.1.6
Subs-backup.php 1.1.11 ??
Subs.php 1.1.13 1.1.13
Themes.php 1.1.11 1.1.11
ViewQuery.php 1.1 1.1
Who.php 1.1 1.1
recaptchalib.php ?? ??
Default Templates 1.1.12 1.1.12
Admin.template.php 1.1.12 1.1.12
Akismet.template.php ?? ??
BoardIndex.template.php 1.1 1.1
Calendar.template.php 1.1 1.1
Combat.template.php 1.1 1.1
Display.template.php 1.1.12 1.1.12
Errors.template.php 1.1 1.1
Help.template.php 1.1 1.1
Login.template.php 1.1 1.1
ManageAttachments.template.php 1.1.9 1.1.9
ManageBans.template.php 1.1 1.1
ManageBoards.template.php 1.1 1.1
ManageCalendar.template.php 1.1 1.1
ManageMembergroups.template.php 1.1 1.1
ManageMembers.template.php 1.1 1.1
ManageNews.template.php 1.1 1.1
ManagePermissions.template.php 1.1 1.1
ManageSearch.template.php 1.1 1.1
ManageSmileys.template.php 1.1 1.1
Memberlist.template.php 1.1 1.1
MessageIndex.template.php 1.1 1.1
Modlog.template.php 1.1 1.1
MoveTopic.template.php 1.1 1.1
Notify.template.php 1.1 1.1
Packages.template.php 1.1.11 1.1.11
PersonalMessage.template.php 1.1 1.1
Poll.template.php 1.1.2 1.1.2
Post.template.php 1.1.5 1.1.5
Printpage.template.php 1.1 1.1
Profile.template.php 1.1.2 1.1.2
Recent.template.php 1.1.9 1.1.9
Register.template.php 1.1.10 1.1.10
Reminder.template.php 1.1 1.1
Reports.template.php 1.1 1.1
Search.template.php 1.1.1 1.1.1
SendTopic.template.php 1.1 1.1
Settings.template.php 1.1 1.1
SplitTopics.template.php 1.1.11 1.1.11
Stats.template.php 1.1 1.1
Themes.template.php 1.1 1.1
Who.template.php 1.1 1.1
Wireless.template.php 1.1 1.1
Xml.template.php 1.1 1.1
index.template.php 1.1.5 1.1.5
Language Files 1.1.13 1.1.13
Admin.english.php 1.1.13 1.1.13
Errors.english.php 1.1.2 1.1.2
Help.english.php 1.1 1.1
Install.english.php 1.1 1.1
Login.english.php 1.1.2 1.1.2
ManageBoards.english.php 1.1 1.1
ManageCalendar.english.php 1.1 1.1
ManageMembers.english.php 1.1 1.1
ManagePermissions.english.php 1.1 1.1
ManageSmileys.english.php 1.1 1.1
Manual.english.php 1.1 1.1
ModSettings.english.php 1.1.5 1.1.5
Modifications.english.php 1.1 1.1
Packages.english.php 1.1.8 1.1.8
PersonalMessage.english.php 1.1 1.1
Post.english.php 1.1 1.1
Profile.english.php 1.1 1.1
Reports.english.php 1.1 1.1
Search.english.php 1.1 1.1
Settings.english.php 1.1 1.1
Stats.english.php 1.1 1.1
Themes.english.php 1.1 1.1
Who.english.php 1.1 1.1
Wireless.english.php 1.1 1.1
index.english.php 1.1.13 1.1.13
Current Templates 1.1 1.1.12
The fix was in Themes/theme-name/index.template.php:
//if ($context['user']['is_guest'])
// $options['collapse_header'] = $_COOKIE['upshrink'] !== 0;
These were previously not commented out.
Posted as an FYI to others having the same error; I don't have time today to debug the thing further, as I haven't had time to update this forum to 2.0 (obviously a good idea, if possible and compatible with our template, which of course could unleash many more hours of work, hence procrastinated-with-good-cause).