I have the same issue. Aperture 3.5 - just upgraded to Mavericks. Export working fine until yesterday - now I can't get the dialogue box to appear - selecting export has no effect at all.
Console shows:
29/10/2013 00:40:47.292 Aperture[383]: *** Assertion failure in -[NSSecureColor initWithColor:], /SourceCache/ViewBridge/ViewBridge-46/NSSecureColor.m:32
followed by
29/10/2013 00:40:47.296 Aperture[383]: -[NSRemoteView viewDidMoveToWindow] caught non-fatal NSInternalInconsistencyException 'unable to convert NSNamedColorSpace System controlColor to Device RGB colorspace' with backtrace (
0 CoreFoundation 0x00007fff8a71041c __exceptionPreprocess + 172
1 libobjc.A.dylib 0x00007fff8a27de75 objc_exception_throw + 43
2 CoreFoundation 0x00007fff8a7101f8 +[NSException raise:format:arguments:] + 104
3 Foundation 0x00007fff87146c61 -[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:] + 189
4 ViewBridge 0x00007fff9397a65c -[NSSecureColor initWithColor:] + 724
5 ViewBridge 0x00007fff9397a36f +[NSSecureColor secureColorWithColor:] + 48
6 ViewBridge 0x00007fff9399dcfb -[NSRemoteView sendFontSmoothingBackgroundColorToService:] + 40
7 ViewBridge 0x00007fff9399ebf5 -[NSRemoteView viewDidMoveToWindow] + 197
8 AppKit 0x00007fff910f71d0 -[NSView _setWindow:] + 2899
9 AppKit 0x00007fff910f4804 -[NSView addSubview:] + 364
10 AppKit 0x00007fff91108953 -[NSFrameView addSubview:] + 45
11 AppKit 0x00007fff91116cb5 -[NSWindow setContentView:] + 511
12 AppKit 0x00007fff9197c233 -[NSVBSavePanel init] + 287
13 AppKit 0x00007fff916fe5b9 +[NSSavePanel newRemotePanel] + 309
14 AppKit 0x00007fff916fe675 +[NSSavePanel _crunchyRawUnbonedPanel] + 120
15 Aperture 0x0000000109c119fc Aperture + 666108
16 Aperture 0x0000000109bb63ef Aperture + 291823
17 AppKit 0x00007fff912fe3d0 -[NSApplication sendAction:to:from:] + 327
18 ProKit 0x000000010b3d1626 -[NSProApplication sendAction:to:from:] + 101
19 Aperture 0x0000000109fdbe86 Aperture + 4640390
20 AppKit 0x00007fff91319348 -[NSMenuItem _corePerformAction] + 394
21 AppKit 0x00007fff91319084 -[NSCarbonMenuImpl performActionWithHighlightingForItemAtIndex:] + 117
22 AppKit 0x00007fff913684dd -[NSMenu _internalPerformActionForItemAtIndex:] + 35
23 AppKit 0x00007fff91368359 -[NSCarbonMenuImpl _carbonCommandProcessEvent:handlerCallRef:] + 104
24 AppKit 0x00007fff9130f176 NSSLMMenuEventHandler + 716
25 HIToolbox 0x00007fff8c47b6d4 _ZL23DispatchEventToHandlersP14EventTargetRecP14OpaqueEventRefP14HandlerCallRec + 892
26 HIToolbox 0x00007fff8c47ac87 _ZL30SendEventToEventTargetInternalP14OpaqueEventRefP20OpaqueEventTargetRefP14H andlerCallRec + 385
27 HIToolbox 0x00007fff8c48ed90 SendEventToEventTarget + 40
28 HIToolbox 0x00007fff8c4c4a30 _ZL18SendHICommandEventjPK9HICommandjjhPKvP20OpaqueEventTargetRefS5_PP14OpaqueE ventRef + 420
29 HIToolbox 0x00007fff8c4f7618 SendMenuCommandWithContextAndModifiers + 59
30 HIToolbox 0x00007fff8c4f75c4 SendMenuItemSelectedEvent + 178
31 HIToolbox 0x00007fff8c4f74a5 _ZL19FinishMenuSelectionP13SelectionDataP10MenuResultS2_ + 94
32 HIToolbox 0x00007fff8c4d556e _ZL19PopUpMenuSelectCoreP8MenuData5PointdS1_tjPK4RecttjS4_S4_PK10__CFStringPP13 OpaqueMenuRefPt + 1726
33 HIToolbox 0x00007fff8c4d46c6 _HandlePopUpMenuSelection7 + 596
34 AppKit 0x00007fff91367221 _NSSLMPopUpCarbonMenu3 + 4153
35 AppKit 0x00007fff914d1a95 -[NSCarbonMenuImpl _popUpContextMenu:withEvent:forView:withFont:] + 192
36 ProKit 0x000000010b461fc2 -[NSProCarbonMenuImpl _popUpContextMenu:withEvent:forView:withFont:] + 375
37 ProKit 0x000000010b3c3ccc -[NSMenu(ProAdditions) _popUpContextMenu:withEvent:forView:withFont:] + 741
38 AppKit 0x00007fff9184506f -[NSView rightMouseDown:] + 127
39 AppKit 0x00007fff912e2f71 -[NSWindow sendEvent:] + 3721
40 ProKit 0x000000010b3f3e50 -[NSProWindow sendEvent:] + 236
41 AppKit 0x00007fff91283744 -[NSApplication sendEvent:] + 2021
42 ProKit 0x000000010b3d251e -[NSProApplication sendEvent:] + 129
43 Aperture 0x0000000109fdbb35 Aperture + 4639541
44 AppKit 0x00007fff910d3a29 -[NSApplication run] + 646
45 ProKit 0x000000010b3d2dca NSProApplicationMain + 333
46 Aperture 0x0000000109b7ef50 Aperture + 65360
47 Aperture 0x0000000109b7e8f4 Aperture + 63732
)
timestamp: 00:40:47.296 Tuesday 29 October 2013
process/thread/queue: Aperture (383) / 0x7fff77698310 / com.apple.main-thread
code: line 607 of /SourceCache/ViewBridge/ViewBridge-46/ViewBridgeUtilities.m in logCaughtException
domain: exceptions